WO2012138097A2 - Procédé et appareil de transmission/réception de canal de commande de liaison descendante dans un système de communication sans fil - Google Patents

Procédé et appareil de transmission/réception de canal de commande de liaison descendante dans un système de communication sans fil Download PDF

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Publication number
WO2012138097A2
WO2012138097A2 PCT/KR2012/002488 KR2012002488W WO2012138097A2 WO 2012138097 A2 WO2012138097 A2 WO 2012138097A2 KR 2012002488 W KR2012002488 W KR 2012002488W WO 2012138097 A2 WO2012138097 A2 WO 2012138097A2
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WIPO (PCT)
Prior art keywords
pdcch
cell
downlink
transmission
vrb
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PCT/KR2012/002488
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English (en)
Korean (ko)
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WO2012138097A3 (fr
Inventor
김학성
양석철
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엘지전자 주식회사
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Priority to EP12768639.2A priority Critical patent/EP2696548B1/fr
Priority to KR1020137023763A priority patent/KR102109408B1/ko
Priority to US14/008,450 priority patent/US9363805B2/en
Publication of WO2012138097A2 publication Critical patent/WO2012138097A2/fr
Publication of WO2012138097A3 publication Critical patent/WO2012138097A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/0031—Multiple signaling transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0072—Error control for data other than payload data, e.g. control data
    • H04L1/0073—Special arrangements for feedback channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
    • H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]

Definitions

  • the following description relates to a wireless communication system, and more particularly, to a method and an apparatus for transmitting and receiving a downlink control channel to a downlink receiving apparatus in which one or more cells are configured.
  • the downlink receiving apparatus may receive scheduling information for uplink transmission and / or downlink reception through a downlink control channel.
  • a downlink receiving apparatus defined in a conventional wireless communication system a method and a location in which a physical downlink control channel (PDCCH) transmitted in a specific region of a downlink subframe is mapped on a physical resource in one serving cell are defined. have.
  • PDCCH physical downlink control channel
  • the downlink control channel may be transmitted on a corresponding carrier or another carrier.
  • a method of mapping a new type of PDCCH onto a physical resource It is a technical task to provide a method for accurately and efficiently determining the position.
  • Another object of the present invention is to provide an efficient signaling scheme for indicating a location where a new type of PDCCH is mapped on a physical resource.
  • a method for receiving a physical downlink control channel (PDCCH) by a downlink receiving apparatus configured with one or more cells includes a virtual resource block (VRB) for potential PDCCH transmission.
  • VRB virtual resource block
  • the information on the first slot and the second slot of the downlink subframe may be defined in common.
  • a method of transmitting a physical downlink control channel (PDCCH) by a downlink transmission apparatus according to another embodiment of the present invention to a downlink reception apparatus in which one or more cells is configured is provided for potential PDCCH transmission.
  • the information on the first slot and the second slot of the downlink subframe may be defined in common.
  • At least one cell is configured and the downlink receiving apparatus for receiving a physical downlink control channel (PDCCH), the downlink signal from the downlink transmission apparatus Receiving modules receiving; Transmission modules for transmitting an uplink signal to the downlink transmission device; And the receiving modules
  • the first slot and the second slot of the downlink subframe may be defined in common.
  • a downlink transmission apparatus for transmitting a physical downlink control channel (PDCCH) to a downlink reception apparatus configured with one or more cells according to another embodiment of the present invention is provided from a downlink reception apparatus.
  • VRB virtual resource block
  • a cell or downlink receiving device configured to transmit the PDCCH through the transmission modes using the VRB set, wherein the PDCCH demodulation based on a specific reference signal is set;
  • Information about the set may be defined in common for the first slot and the second slot of the downlink subframe. In the embodiments according to the present invention, the following matters may be commonly applied.
  • the VRB set configuration information for a cell for which PDCCH cross interleaving is configured or for a cell for which PDCCH demodulation is configured based on a specific reference signal is separately provided for each of the first slot and the second slot of the downlink subframe. Can be defined.
  • the VRB set configuration information for a plurality of cells for which PDCCH cross interleaving is set or for a plurality of cells for which the PDCCH demodulation is set based on a specific reference signal is configured for the VRB set of the first slot for the plurality of cells.
  • Information may be defined in common, and information on the VRB set of the second slot may be defined in common for the plurality of cells.
  • Downlink allocation scheduling information may be transmitted through a PDCCH transmitted in a first slot of the downlink subframe, and uplink grant scheduling information may be transmitted through a PDCCH transmitted in a second slot of the downlink subframe.
  • a cell in which PDCCH non-cross interleaving is configured or a downlink receiving device-the VRB set for the cell in which the PDCCH demodulation is configured based on a specific reference signal can be mapped to a set of physical resource blocks (PRBs) on the corresponding cell.
  • PRBs physical resource blocks
  • the VRB set for a cell for which PDCCH cross interleaving is configured or for a cell for which PDCCH demodulation based on a specific reference signal is set may be mapped to a PRB set on a predetermined sal.
  • the VRB set for all of the one or more cells may be mapped to a PRB set on a given cell.
  • the predetermined cell may be a primary cell (PCell).
  • the VRB set may be a search space for the PDCCH.
  • the VRB set configuration information may be transmitted through higher layer signaling than a physical layer.
  • the PDCCH may be located in an OFDM symbol except for the first N (N ⁇ 3) OFDM Orthogonal Frequency Division Multiplex) symbols of the downlink subframe.
  • the PDCCH may be an R-PDCCH or an e-PDCCH.
  • a method of mapping a new type of PDCCH onto a physical resource and The position can be determined accurately and efficiently.
  • an efficient signaling scheme for indicating a location where a new type of PDCCH is mapped on a physical resource may be provided.
  • 1 is a diagram for explaining the structure of a radio frame.
  • 2 is a diagram illustrating a resource grid in a downlink slot.
  • 3 is a diagram illustrating a structure of a downlink subframe.
  • FIG. 4 is a diagram illustrating a structure of an uplink subframe.
  • FIG. 5 is a configuration diagram of a wireless communication system having multiple antennas.
  • FIG. 6 is a diagram for explaining a downlink reference signal.
  • FIG. 7 is a diagram for explaining a sounding reference signal.
  • FIG. 8 is a diagram for describing resource division for a repeater.
  • FIG. 9 is a diagram illustrating a format in which PUCCH formats are mapped in an uplink physical resource block.
  • FIG. 10 is a diagram illustrating an example of determining a PUCCH resource for ACK / NACK.
  • FIG. 11 illustrates a structure of an ACK / NACK channel in the case of a normal CP.
  • FIG. 12 is a diagram illustrating a structure of a CQI channel in the case of a normal CP.
  • FIG. 13 is a diagram illustrating a PUCCH channel structure using block spreading.
  • 14 is a diagram for describing carrier aggregation.
  • 15 is a diagram for explaining cross-carrier scheduling.
  • FIG. 16 illustrates a method of transmitting uplink control information through a PUSCH.
  • 17 is a diagram for explaining multiplexing of uplink data and control information.
  • 18 is a diagram for describing resource element mapping of an e-PDCCH.
  • 19 is a diagram illustrating an example in which e—PDCCH cross interleaving is not applied.
  • 20 is a diagram illustrating an example in which e-PDCCH cross interleaving is applied.
  • 21 is a diagram for explaining e-PDCCH blind decoding.
  • 22 is a diagram for describing examples of the present invention for reducing overhead of e-PDCCH SS signaling.
  • 23 to 29 are diagrams for describing various examples in which an e-PDCCH search space is mapped on a physical resource.
  • FIG. 30 is a flowchart illustrating a method of e-PDCCH discovery space configuration signaling and e-PDCCH transmission and reception according to the present invention.
  • FIG. 31 is a diagram showing the configuration of a preferred embodiment of a downlink transmission apparatus and a downlink reception apparatus according to the present invention.
  • each component or feature may be considered to be optional unless otherwise stated.
  • Each component or feature may be embodied in a form that is not combined with other components or features.
  • some components and / or features may be combined to form an embodiment of the present invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of one embodiment may be included in another embodiment, or may be replaced with other configurations or features of another embodiment.
  • the base station has a meaning as a terminal node of a network that directly communicates with the terminal.
  • Certain operations described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is apparent that various operations performed for communication with the terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
  • a 'base station (BS)' may be replaced by terms such as a fixed station, a NodeB, an eNodeB (eNB), and an access point (AP).
  • the repeater may be replaced by terms such as Relay Node (R) and Relay Station (RS).
  • 'Terminal 1 ' may be replaced with terms such as UE Jser Equiment, Mole le Station (MS), Mole le Subscriber Stat ion (MSS), and Subscribing Station (SS).
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE and LTE-A (LTE-Advanced) system and 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in this document may be described by the above standard document.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • T ⁇ Time Division Multiple Access
  • OFDMA Orthogonal Frequency Division Mult iple Access
  • SC-FDMA Single Carrier Frequency Division Mult iple
  • CDMA may be implemented by radio technology such as UTRACUniversal Terrestrial Radio Access) or CDMA2000.
  • TDMA is the Global System for Mobile wireless technology such as communications / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • 0FDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
  • UTRA is part of the UMTS Universal Mobile Telecom unications system.
  • 3GPP LTEdong term evolution (3GPP) is part of Evolved UMTS (E-UMTS) using E-UTRA, and employs 0FDMA in downlink and SC-FDMA in uplink.
  • LTE-A Advanced
  • WiMAX can be described by the IEEE 802.16e standard (WirelessMAN—OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system). For clarity, the following description focuses on 3GPP LTE and 3GPP LTE-A systems, but the technical spirit of the present invention is not limited thereto.
  • a structure of a radio frame of the 3GPP LTE system will be described with reference to FIG. 1.
  • uplink / downlink data packet transmission is performed in subframe units, and one subframe is defined as a predetermined time interval including a plurality of 0FDM symbols.
  • the 3GPPLTE standard supports a type 1 radio frame structure applicable to FDEK Frequency Division Duplex (FDEKFrequency Division Duplex) and a type 2 radio frame structure applicable to TDD (Time Division. Duplex).
  • FIG. 1 (a) is a diagram showing the structure of a type 1 radio frame.
  • One radio frame consists of 10 subframes, and one subframe consists of two slots in the time domain.
  • the time it takes for one subframe to be transmitted is called a transmission time interval ( ⁇ ).
  • one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
  • One slot includes a plurality of 0FDM symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain.
  • RBs resource blocks
  • resource A block (RB) is a resource allocation unit and may include a plurality of consecutive subcarriers in one slot.
  • the number of OFDM symbols included in one slot may vary depending on the configuration of a cyclic prefix (CP).
  • CP has an extended CP (normal CP) and a normal CP (normal CP).
  • normal CP normal CP
  • the number of OFDM symbols included in one slot may be seven.
  • the OFDM symbol is configured by an extended CP, since the length of one OFDM symbol is increased, the number of OFDM symbols included in one slot is smaller than that of the normal CP.
  • the number of OFDM symbols included in one slot may be six. If the channel state is unstable, such as when the terminal moves at a high speed, an extended CP may be used to further reduce intersymbol interference.
  • Type 2 radio frames consist of two half frames, each of which has five subframes, a Downlink Pilot Time Slot (DwPTS), a Guard Per iod (GP), and an Uplink Pilot Time Slot (UpPTS). ), And one subframe consists of two slots. DwPTS is used for initial cell search, synchronization or channel estimation at the terminal.
  • DwPTS Downlink Pilot Time Slot
  • GP Guard Per iod
  • UpPTS Uplink Pilot Time Slot
  • UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
  • the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • one subframe consists of two slots regardless of the radio frame type.
  • the structure of the radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe and the number of symbols included in the slot may be variously changed.
  • FIG. 2 is a diagram illustrating a resource grid in a downlink slot.
  • One downlink slot includes seven OFDM symbols in the time domain and one resource block (RB) is shown to include 12 subcarriers in the frequency domain, but the present invention is not limited thereto.
  • generic CP Cyclic In the case of a prefix, one slot includes 7 OFDM symbols, but in the case of an extended CP, one slot may include 6 OFDM symbols.
  • Each element on the resource grid is called a resource element.
  • One resource block includes 12x7 resource element.
  • the number of 1 of resource blocks included in the downlink slot depends on the downlink transmission bandwidth.
  • the structure of the uplink slot may be the same as the structure of the downlink slot.
  • FIG. 3 is a diagram illustrating a structure of a downlink subframe. Control of which up to three OFDM symbols of the first part of the first slot in one subframe are allocated a control channel. Corresponds to the area. The remaining OFDM symbols correspond to a data region to which a Physical Downlink Shared Chancel (PDSCH) is allocated.
  • Downlink control channels used in the 3GPP LTE system include, for example, a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), and a Physical Q Indicator. Channel (Physical Hybrid automatic repeat request Indicator Channel; PHICH).
  • the PCFICH is transmitted in the first 0FOM symbol of a subframe and includes information on the number of OFDM symbols used for control channel transmission in the subframe.
  • PHICH includes a HARQ AC / NACR signal as a male answer of uplink transmission.
  • Control information transmitted through the PDCCH is referred to as downlink control information (DCI).
  • DCI includes uplink or downlink scheduling information or an uplink transmit power control command for a certain terminal group.
  • PDCCH includes resource allocation and transmission format of DL-SCH, resource allocation information of UL-SCH, paging information of PCH, system information on DL-SCH, and PDSCH.
  • a plurality of PDCCHs may be transmitted in the control region.
  • the terminal may monitor the plurality of PDCCHs.
  • PDCCH is one or more consecutive It is transmitted as an aggregate of control channel elements (CCEs).
  • CCE is a logical allocation unit used to provide a PDCCH at a coding rate based on the state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups.
  • the format of the PDCCH and the number of available bits are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • the base station determines the PDCCH format according to the DCI transmitted to the terminal, and adds a cyclic redundancy check (CRC) to the control information.
  • CRC cyclic redundancy check
  • the CRC is masked with an identifier called Radio Network Temporary Identifier (RNTI) according to the owner or purpose of the PDCCH. If the PDCCH is for a specific UE, the cell—RNTI (C-RNTI) identifier of the UE may be masked to the CRC.
  • RNTI Radio Network Temporary Identifier
  • a paging indicator identifier may be masked to the CRC.
  • the PDCCH is for system information (more specifically, system information block (SIB))
  • SI-RNTI system information RNTI
  • random access -RNTKRA-RNTI may be masked to the CRC.
  • the uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a physical uplink control channel (PUCCH) including uplink control information is allocated to the control region.
  • a physical uplink shared channel (PUSCH) including user data is allocated.
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • one UE does not simultaneously transmit a PUCCH and a PUSCH.
  • PUCCH for one UE is allocated to an RB pair in a subframe. Resource blocks belonging to a resource block pair occupy different subcarriers for a slot. This is called that the resource block pair allocated to the PUCCH is frequency-hopped at the slot boundary.
  • FIG. 5 is a configuration diagram of a wireless communication system having multiple antennas.
  • the theoretical channel transmission is proportional to the number of antennas unlike the case where only a plurality of antennas are used in a transmitter or a receiver. Dose is increased. Therefore, the transmission rate can be improved and the frequency efficiency can be significantly improved.
  • the transmission rate is theoretically the maximum transmission rate with a single antenna. 0 ) may increase as the rate of increase () multiplied.
  • a ⁇ 0 communication system using four transmit antennas and four receive antennas can theoretically obtain four times the transmission rate compared to a single antenna system.
  • the transmission information may be expressed as follows.
  • Each transmission information S ⁇ , S f, S N T may have a different transmission power.
  • transmission information transmitted power adjustment can be expressed as follows.
  • S may be expressed as follows using the diagonal matrix p of the transmission power.
  • the weighting matrix W is applied to the information vector S whose transmission power is adjusted to be actually transmitted.
  • W plays a role of properly distributing transmission information to each antenna according to a transmission channel situation.
  • vector X can be expressed as:
  • ⁇ ⁇ means a weight between the / th transmit antenna and the _ th information.
  • W is also called a precoding matrix.
  • the received signals ⁇ ⁇ ' ⁇ ⁇ of each antenna may be expressed as vectors as follows.
  • channels may be classified according to transmit / receive antenna indexes.
  • the channel from the transmitting antenna / to the receiving antenna / will be denoted by ⁇ .
  • the order of the indexes is the receive antenna Note that the index is first, and the index of the transmit antenna is later.
  • FIG. 5 (b) is a diagram illustrating channels from ⁇ transmit antennas to receive antennas /.
  • the channels may be bundled and displayed in the form of a vector and a matrix.
  • a channel arriving from a total of ⁇ transmitting antennas to a receiving antenna / ⁇ may be represented as follows.
  • AWGN white noise
  • the received signal may be expressed as follows through the above-described mathematical modeling.
  • the number of rows and columns of the channel matrix H indicating the channel state is determined by the number of transmit and receive antennas.
  • the number of rows in the channel matrix H is equal to the number of receiving antennas, and the number of columns is equal to the number of transmitting antennas. That is, the channel matrix H is ⁇ XTV.
  • the rank of a matrix is defined as the minimum number of rows or columns that are independent of each other. Thus, the rank of the matrix cannot be greater than the number of rows or columns.
  • the rank (ra "A; (H)) of the channel matrix H is limited as follows.
  • Another definition of a tank is that when the eigenvalue decomposition of a matrix
  • the physical meaning of the ram in the channel matrix is the maximum number that can send different information in a given channel.
  • the transmitted packet is transmitted through a wireless channel
  • signal distortion may occur during the transmission process.
  • the distortion In order to properly receive the distorted signal, the distortion must be corrected in the received signal using the channel information.
  • a signal known to both the transmitting side and the receiving side is transmitted, and a method of finding the channel information with a distortion degree when the signal is received through the channel is mainly used.
  • the signal is called a pilot signal or a reference signal.
  • each transmit antenna and receive Knowing the channel conditions between the antennas allows you to receive the correct signal. Therefore, a separate reference signal must exist for each transmit antenna.
  • the downlink reference signal includes a common reference signal (CRS) shared by all terminals in a cell and a dedicated reference signal (DRS) only for a specific terminal.
  • CRS common reference signal
  • DRS dedicated reference signal
  • the receiver estimates the channel status from the CRS and feeds back indicators related to channel quality such as channel quality indicator (CQI), precoding matrix index (PMI) and / or rank indicator (RI) to the transmitter (base station). can do.
  • CQI channel quality indicator
  • PMI precoding matrix index
  • RI rank indicator
  • the CRS may be called a cell-specific reference signal.
  • RS related to feedback of Channel State Information (CSI) such as CQI / PMI / RI may be separately defined as CSI—RS.
  • the DRS may be transmitted through the corresponding RE.
  • the UE may be instructed as to whether DRS is present from a higher layer and may be instructed that the DRS is valid only when the corresponding PDSCH is mapped.
  • the DRS may also be called a UE-specific reference signal or a demodulation reference signal (DMRS).
  • FIG. 6 is a diagram illustrating a pattern in which CRSs and DRSs defined in an existing 3GPP LTE system (eg, Release-8) are mapped onto a downlink resource block pair (RB pair).
  • a downlink resource block pair as a unit to which a reference signal is mapped may be expressed in units of 12 subcarriers on one subframe X frequency in time. That is, one resource block pair has 14 OFDM symbol lengths in the case of a general CP (FIG. 6 (a)) and 12 OFDM symbol lengths in the case of an extended CP (FIG. 6 (b)).
  • FIG. 6 shows a position of a reference signal on a resource block pair in a system in which a base station supports four transmit antennas.
  • the resource elements RE denoted by '0', '2' and '3' in FIG. 6 indicate positions of CRSs with respect to antenna port indexes 0, 1, 2 and 3, respectively. Meanwhile, the resource element denoted as 'D 1 ' in FIG. 6 indicates the position of the DRS.
  • the CRS will be described in detail.
  • the CRS is used to estimate the channel of the physical antenna terminal, and is a reference signal that can be commonly received by all UEs in a cell, and is distributed over the entire band.
  • CRS may be used for channel state information (CSI) acquisition and data demodulation purposes.
  • CSI channel state information
  • CRS is defined in various forms according to the antenna configuration of the transmitting side (base station).
  • 3GPP LTE 3GPP LTE
  • the system supports various antenna configurations (Antenna conf igurat ion), and the downlink signal transmitting side (base station) has three antenna configurations: a single antenna, two transmitting antennas, and four transmitting antennas.
  • a reference signal for a single antenna port is arranged.
  • reference signals for two antenna ports are arranged in a time division multiplexing and / or frequency division multiplexing scheme. That is, reference signals for the two antenna ports may be arranged in different time resources and / or different frequency resources to be distinguished from each other.
  • the channel information estimated by the downlink signal receiving side (terminal) through the CRS includes single antenna transmission, transmit diversity, and closed-loop spatial multiplexing. It can be used for demodulation of transmitted data using transmission techniques such as open-loop spatial multiplexing, multi-user MIMO (MU-MIMO).
  • MU-MIMO multi-user MIMO
  • the reference signal when transmitting a reference signal from one antenna port, the reference signal is transmitted to a resource element (RE) position designated according to the reference signal pattern, and a signal is transmitted to a resource element (RE) position designated for another antenna port. Do not send.
  • Equation 12 k is a subcarrier index, / is a symbol index, / / is an antenna port index.
  • the number of OFDM symbols of one downlink slot is used, is the number of resource blocks allocated to the downlink, is a slot index, and v is a cell ID. mod stands for modal operation.
  • the position of the reference signal in the frequency domain depends on the V shift value. Since the V shift value also depends on the cell ID, the position of the reference signal has a different frequency shift value for each cell.
  • the cell may be shifted by shifting the position on the frequency domain of the CRS for each cell.
  • a reference signal differs every three subcarriers
  • one cell may be arranged on a 3k subcarrier and another cell may be disposed on a 3k + l subcarrier.
  • the reference signal is arranged at 6 RE intervals (ie, 6 subcarrier spacings) in the frequency domain, and maintains 3 E intervals in the frequency domain from the RE where reference signals for other antenna ports are arranged.
  • power boosting may be applied to the CRS. Power boosting means that power is taken from a RE other than the RE allocated for the reference signal among the resource elements (REs) of one OFDM symbol to transmit the reference signal at a higher power.
  • reference signal positions are arranged at regular intervals starting from the symbol index (/) 0 of each slot.
  • the time interval is defined differently depending on the CP length.
  • the general CP case is located at symbol indexes 0 and 4 of the slot
  • the extended CP case is located at symbol indexes 0 and 3 of the slot.
  • Only one reference signal is defined for a maximum of two antenna ports in one 0FOM symbol. Therefore, when transmitting 4 transmit antennas, reference signals for antenna ports 0 and 1 are located at symbol indexes 0 and 4 of slots (symbol indexes 0 and 3 in case of an extended CP), and reference signals for antenna ports 2 and 3 It is located in symbol index 1 of the slot.
  • the frequency positions of the reference signals for the antenna ports 2 and 3 are switched with each other in the second slot.
  • a system with an extended antenna configuration (eg, an LTE-A system) can be designed.
  • the extended antenna configuration may be, for example, eight transmit antenna configurations.
  • backward compatibility backward compatibility ibi 1ity
  • adding a CRS for a new antenna port to a system having an existing antenna configuration has a disadvantage in that the reference signal overhead is rapidly increased to decrease the data rate.
  • CSI-RS channel state information
  • DRS (or terminal-specific reference signal) is a reference signal used for data demodulation, Equivalent channel that combines the precoding weight transmitted in each transmitting antenna and the transmission channel when the terminal receives the reference signal by using the precoding weight used for a specific terminal as it is in the reference signal when transmitting multiple antennas. To estimate.
  • Equation 13 is for the case of a general CP
  • Equation 14 is for the case of an extended CP.
  • A is a subcarrier index
  • / is a symbol index
  • V shift value means a cell ID.
  • Sal ID means a cell ID.
  • the position of the reference signal in the frequency domain depends on the V shift value. Since the V sh i ft value also depends on the Sal ID, the position of the reference signal has a different frequency shift value for each cell.
  • DRS-based data demodulation is considered to support efficient reference signal operation and advanced transmission scheme. That is, apart from DRS (antenna port index 5) for tank 1 beamforming defined in the existing 3GPP LTE (for example, Release-8), two or more layers may be used to support data transmission through an additional antenna. DRS can be defined.
  • CoMP Cooperative Multi-Point
  • a CoMP transmission / reception technique also referred to as co-MIMO, collaborative MIM0 or network MIM0, etc.
  • CoMP technology may increase the performance of the terminal located in the cell-edge and increase the average sector throughput.
  • inter-cell interference may reduce performance and average sector yield of a terminal located in a cell-boundary.
  • ICI inter-cell interference
  • FFR fractional frequency reuse
  • MP transmission scheme can be applied.
  • CoMP schemes applicable to downlink can be classified into joint processing (JP) techniques and coordinated scheduling / beamforming (CS / CB) techniques.
  • JP joint processing
  • CS / CB coordinated scheduling / beamforming
  • the JP technique may use data at each point (base station) of the CoMP cooperative unit.
  • CoMP cooperation unit refers to a set of base stations used in the cooperative transmission scheme.
  • the JP technique can be classified into a joint transmission technique and a dynamic cell selection technique.
  • the joint transmission technique refers to a technique in which a PDSCH is transmitted from a plurality of points (part or all of CoMP cooperative units) at a time. That is, data transmitted to a single terminal may be simultaneously transmitted from a plurality of transmission points. According to the joint transmission technique, the quality of a received signal can be improved coherently or non-coherent ly, and can also actively cancel interference to other terminals. .
  • Dynamic cell selection schemes allow the PDSCH to operate from one point (in CoMP cooperative units) The technique of transmission. That is, data transmitted to a single terminal at a specific time point is transmitted from one point, and other points in the cooperative unit do not transmit data to the corresponding terminal at that time point, and a point for transmitting data to the corresponding terminal is dynamically selected. Can be.
  • coordinated multi-point reception means receiving a signal transmitted by coordination of a plurality of geographically separated points.
  • the C () MP technique that can be applied in the uplink case may be classified into joint reception (JR) and coordinated scheduling / beamforming (CS / CB).
  • the JR scheme means that a signal transmitted through a PUSCH is received at a plurality of reception points.
  • the CS / CB scheme determines that a PUSCH is received at only one point, but user scheduling / bumping is determined by coordination of cells of a CoMP cooperative unit. It means to be.
  • SRS Sounding Reference Signal
  • the Sounding Reference Signal is mainly used for frequency-selective scheduling on the uplink by the base station measuring channel quality and is not associated with the transmission of uplink data and / or control information. Do not. However, the present invention is not limited thereto, and the SRS may be used for the purpose of improved power control or for supporting various start-up functions of terminals not recently scheduled.
  • the start function is, for example, an initial Modulation and Coding Scheme (MCS), initial power control for data transmission, timing advance and frequency anti-selective scheduling (frequency in the first slot of the subframe).
  • MCS Modulation and Coding Scheme
  • the resources may be selectively allocated and may include pseudo-random hopping scheduling at different frequencies in the second slot.
  • the SRS may be used for downlink channel quality measurement under the assumption that the radio channel is reciprocal between uplink and downlink. This assumption is particularly valid in time division duplex (TDD) systems in which uplink and downlink share the same frequency band and are distinguished in the time domain.
  • TDD time division duplex
  • the subframe in which the SRS is transmitted by any terminal in the cell is indicated by cell-specific broadcast signaling. 4-bit cell-specific
  • the 'SrsSubframeConfiguration' parameter represents 15 possible configurations of subframes in which an SRS can be transmitted within each radio frame. This configuration can provide the flexibility to adjust the SRS overhead according to the network deployment scenario.
  • the configuration of the other (16th) of the parameter is to switch off the SRS transmission in the cell completely, for example, it may be suitable for a cell serving mainly high speed terminals.
  • the SRS is always transmitted on the last SC-FDMA symbol of the configured subframe.
  • the SRS and DeModulation Reference Signal (DMRS) are located on different SOFDMA symbols.
  • PUSCH data transmissions are not allowed on the SC ⁇ FDMA symbol designated for SRS transmission, and therefore do not exceed approximately 7% even at the highest sounding overhead (ie, when there is an SRS transmission symbol in every subframe). .
  • Each SRS symbol is generated by a basic sequence (random sequence or Zadoff-Chu-based sequence set) for a given time unit and frequency band, and all terminals in a cell use the same basic sequence.
  • SRS transmissions from a plurality of terminals in a cell in the same time unit and the same frequency band are orthogonally distinguished by different cyclic shifts of basic sequences allocated to the plurality of terminals.
  • SRS sequences of different cells can be distinguished by assigning different base sequences from cell to cell, but orthogonality between different base sequences is not guaranteed. Repeater
  • Repeaters may be considered, for example, to extend high data rate coverage, improve group mobility, ad hoc network deployment, improve cell boundary yield and / or provide network coverage in new areas.
  • the repeater plays a role of forwarding transmission and reception between the base station and the terminal, and two types of links (backhaul link and access link) having different attributes are applied to each carrier frequency band.
  • the base station may comprise a donor cell.
  • the repeater is wirelessly connected to the radio-access network through the donor cell.
  • the backhaul link between the base station and the repeater may be represented as a backhaul downlink when using a downlink frequency band or a downlink subframe resource, and as a backhaul uplink when using an uplink frequency band or an uplink subframe resource.
  • the frequency band is a resource allocated in the FDE Frequency Division Duplex) mode
  • the subframe is a resource allocated in the TDD Time Division Duplex) mode.
  • the access link between the repeater and the terminal (s) uses a downlink frequency band or a downlink subframe resource, it is represented as an access downlink, and when the uplink frequency band or an uplink subframe resource is used, access uplink. Can be represented by a link.
  • the base station requires a function of uplink reception and downlink transmission
  • the terminal requires a function of uplink transmission and downlink reception.
  • the repeater requires all the functions of the backhaul uplink transmission to the base station, the access uplink reception from the terminal, the backhaul downlink reception from the base station, and the access downlink transmission to the terminal.
  • the case in which the backhaul link operates in the same frequency band as the access link is referred to as 'in-band', and the frequency band in which the backhaul link and the access link are different. This is called 1 out-band.
  • a terminal operating according to an existing LTE system for example, Release-8) (hereinafter referred to as a legacy terminal).
  • a legacy terminal must be able to connect to the donor cell.
  • the repeater may be classified as a transparent repeater or a non-transparent repeater.
  • a transparent means a case in which a terminal does not recognize whether it communicates with a network through a repeater
  • a non-transient refers to a case in which a terminal recognizes whether a terminal communicates with a network through a repeater.
  • the repeater may be divided into a repeater configured as part of a donor cell or a repeater controlling a cell by itself.
  • a repeater configured as part of the donor cell may have a repeater identifier (ID) but does not have a repeater's own identity.
  • ID repeater identifier
  • RRM Radio Resource Management
  • a relay configured as part of the donor cell.
  • a repeater may support the legacy terminal.
  • various types and type-2 repeaters of smart repeaters, decode-and-forward relays, L2 (ge Layer 2) repeaters are such repeaters.
  • the repeater controls one or several cells, and each cell controlled by the repeater is provided with a unique physical layer cell identity, and may use the same RRM mechanism. From the terminal point of view, there is no difference between accessing a cell controlled by a repeater and a cell controlled by a general base station.
  • the cell controlled by this repeater may support the legacy terminal.
  • self-backhauling repeaters, L3 (third layer) repeaters, type-1 repeaters and type-la repeaters are such repeaters.
  • the type-1 repeater is an in-band repeater that controls a plurality of cells, each of which appears to be a separate cell from the donor cell from the terminal's point of view.
  • the plurality of cells have their own physical cell IDs (defined in LTE release-8), and the repeater may transmit its own synchronization channel, reference signal, and the like.
  • the terminal The scheduling information and HARQ feedback can be directly received from the repeater, and the control channel (scheduling request (SR), CQI, ACK / NACK, etc.) can be transmitted to the repeater.
  • the type-1 repeater appears to be a legacy base station (base stations operating in accordance with the LTE Release-8 system). That is, it has backward compatibility (backward compat ibi 1ity). Meanwhile, for terminals operating according to the LTE-A system, the type-1 repeater may be seen as a base station different from the legacy base station, and may provide a performance improvement.
  • the type-la repeater has the same features as the type-1 repeater described above in addition to operating out-band.
  • the operation of the type-la repeater may be configured to minimize or eliminate the impact on L1 (first layer) operation.
  • the type-2 repeater is an in-band repeater and does not have a separate physical cell ID and thus does not form a new cell.
  • the type-2 repeater is transparent to the legacy terminal, and the legacy terminal is not aware of the existence of the type-2 repeater.
  • Type-2 repeaters may transmit PDSCH, but do not transmit at least CRS and PDCCH.
  • resource partitioning In order for the repeater to operate in-band, some resources in time-frequency space must be reserved for the backhaul link and these resources can be configured not to be used for the access link. This is called resource partitioning.
  • the backhaul downlink and the access downlink may be multiplexed in a time division multiplexing (TDM) scheme on one carrier frequency (ie, only one of the backhaul downlink or the access downlink is activated at a specific time).
  • TDM time division multiplexing
  • the backhaul uplink and access uplink may be multiplexed in a TDM manner on one carrier frequency (ie, only one of the backhaul uplink or access uplink is activated at a particular time).
  • Backhaul link multiplexing in FDD backhaul downlink transmission is performed in downlink frequency band
  • backhaul uplink transmission is performed in uplink frequency band
  • Backhaul link multiplexing in TDD may be described as backhaul downlink transmission is performed in a downlink subframe of a base station and a repeater and backhaul uplink transmission is performed in an uplink subframe of a base station and a repeater.
  • an in-band repeater for example, when a backhaul downlink reception from a base station and an access downlink transmission to a terminal are simultaneously performed in a predetermined frequency band, a signal transmitted from the transmitting end of the repeater is received at the receiving end of the repeater.
  • Signal interference or RF jamming may occur at the RF front-end of the repeater.
  • signal interference may occur at the RF front end of the repeater. Therefore, simultaneous transmission and reception in one frequency band in a repeater is provided with sufficient separation between the received signal and the transmitted signal (e.g., the antenna is separated from the transmitting antenna in a geographically separated space (e.g. above ground / underground). Is not provided unless) is provided.
  • a first subframe 1010 is a general subframe, and a downlink (ie, access downlink) control signal and data are transmitted from a repeater to a terminal, and the second subframe 1020 is a multicast broadcast single frequency (MBSFN).
  • MBSFN multicast broadcast single frequency
  • a control signal is transmitted from the repeater to the terminal in the control region 1021 of the downlink subframe, but no transmission is performed from the repeater to the terminal in the remaining region 1022 of the downlink subframe.
  • the legacy UE since the physical downlink control channel (PDCCH) is expected to be transmitted in all downlink subframes (in other words, the repeater receives legacy PDCCHs in every subframe in the subframe and measures the function). It is necessary to support to perform the)), in order to ensure the correct operation of the legacy UE in all downlink subframe It is necessary to send the PDCCH.
  • PDCCH physical downlink control channel
  • the repeater needs to transmit access downlink rather than receive the backhaul downlink.
  • the PDCCH since the PDCCH is transmitted from the repeater to the terminal in the control region 1021 of the second subframe, backward compatibility with respect to the legacy terminal served by the repeater may be provided.
  • the repeater In the remaining region 1022 of the second subframe, the repeater may receive the transmission from the base station while no transmission is performed from the repeater to the terminal. Therefore, through this resource partitioning scheme, access downlink transmission and backhaul downlink reception may not be simultaneously performed in an in-band repeater.
  • the MBSFN subframe is a subframe for a multimedia broadcast and multicast service (MBMS) in principle, and an MBMS means a service for simultaneously transmitting the same signal in multiple cells.
  • the control region 1021 of the second subframe may be referred to as a relay non-hearing section.
  • the repeater non-hearing period means a period during which the repeater transmits the access downlink signal without receiving the backhaul downlink signal.
  • the interval may be set to 2 or 3 OFDM lengths as described above.
  • the repeater may perform access downlink transmission to the terminal and receive the backhaul downlink from the base station in the remaining area 1022.
  • the guard time GT needs to be set in the first partial section of the backhaul downlink reception region 1022 so that the repeater can perform transmission / reception mode switching.
  • a guard time GT for the reception / transmission mode switching of the repeater may be set.
  • the guard time of the last part of the subframe may not be defined or set.
  • Such guard time may be defined only in a frequency domain configured for backhaul downlink subframe transmission in order to maintain backward compatibility (when a guard time is set in an access downlink period, legacy terminals cannot be supported).
  • the repeater may receive the PDCCH and the PDSCH from the base station.
  • the PDCCH for the repeater may be represented as a relay-PDCCH (R-PDCCH) in the sense of a relay dedicated physical channel.
  • PUCCH Physical Uplink Control Channel
  • the uplink control information (UCI) transmitted through the PUCCH may include a scheduling request (SR), HARQ ACK / NACK information, and downlink channel measurement information.
  • SR scheduling request
  • HARQ ACK / NACK information HARQ ACK / NACK information
  • HARQ ACK / NACK information may be generated according to whether the decoding of the downlink data packet on the PDSCH is successful.
  • 1 bit is transmitted as ACK / NACK information for downlink single codeword transmission, and 2 bits are transmitted as ACK / NACK information for downlink 2 codeword transmission.
  • Channel measurement information refers to feedback information related to the multiple input multiple output (MIMO) scheme, and includes channel quality indicator (CQI), precoding matrix index (PMI), and rank indicator (Rank Indicator (RI) may be included. These channel measurement information may be collectively expressed as CQI. 20 bits per subframe may be used for transmission of the CQI.
  • CQI channel quality indicator
  • PMI precoding matrix index
  • RI rank indicator
  • PUCCH may be modulated using Binary Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK).
  • Control information of a plurality of terminals may be transmitted through a PUCCH, and when a code division multiplexing (CDM) is performed to distinguish signals of the respective terminals, a length of 12 CAZAC (constant) 1 ⁇ 2plitude zero autocorrelation) Since the CAZAC sequence has a characteristic of maintaining a constant amplitude in the time domain and the frequency domain, it is possible to determine the Peak-to-Average Power Ratio (PAPR) or the Cubic Metric (CM) of the UE. It has a property suitable for increasing coverage by lowering it.
  • PAPR Peak-to-Average Power Ratio
  • CM Cubic Metric
  • the ACK / NACK information for downlink data transmission transmitted through the PUCCH is cured using an orthogonal sequence or an orthogonal cover (0C).
  • control information transmitted on the PUCCH can be distinguished using a cyclically shifted sequence having different cyclic shift (CS) values.
  • Cyclic shifted sequence may be generated by cyclically shifting the base sequence by a specific cyclic shift amount.
  • the specific CS amount is indicated by the cyclic shift index (CS index).
  • CS index cyclic shift index
  • the number of available cyclic shifts may vary.
  • Various kinds of sequences can be used as the basic sequence, and the aforementioned CAZAC sequence is an example.
  • control information that can be transmitted in one subframe by the UE depends on the number of SC-FDMA symbols available for transmission of the control information (that is, RS transmission for coherent detection of PUCCH). SOFDMA symbols other than the SC-FDMA symbol used).
  • PUCCH In the 3GPP LTE system, PUCCH is defined in seven different formats according to transmitted control information, modulation scheme, amount of control information, and the like. Uplink control information (UCI) is transmitted according to each PUCCH format. The attributes can be summarized as shown in Table 1 below.
  • PUCCH format 1 is used for single transmission of SR.
  • an unmodulated waveform is applied, which will be described later in detail.
  • PUCCH format la or lb is used for transmission of HARQ ACK / NACK.
  • PUCCH format la or lb may be used.
  • HARQ ACK / NACK and SR may be transmitted in the same subframe using the PUCCH format la or lb.
  • PUCCH format 2 is used for transmission of CQI, and PUCCH format 2a or 2b is used for transmission of CQI and HARQ ACK / NACK. In the case of an extended CP, PUCCH format 2 may be used for transmission of CQI and HARQ ACK / NACK.
  • the PUCCH is mapped to both edges of the uplink frequency block.
  • the number of PUCCH Bs available by the PUCCH format 2 / 2a / 2b ( ⁇ / ⁇ ⁇ ) may be indicated to terminals in a cell by broadcasting signaling. Can be.
  • the UE allocates PUCCH resources for transmission of uplink control information (UCI) from the base station (BS) by an explicit method or an implicit method through higher layer signaling.
  • UCI uplink control information
  • a plurality of PUCCH resource candidates may be set by a higher layer for the UE, and which PUCCH resource is used may be determined in an implicit manner.
  • the UE may transmit an ACK / NACK for a corresponding data unit through a PUCCH resource implicitly determined by a PDCCH resource that receives a PDSCH from a BS and carries scheduling information for the PDSCH.
  • FIG. 10 shows an example of determining a PUCCH resource for ACK / NACK.
  • the PUCCH resources for ACK / NACK are not pre-allocated to each UE, and a plurality of PUCCH resources are divided and used at every time point by a plurality of UEs in a cell.
  • the PUCCH resource used by the UE to transmit ACK / NACK is determined in an implicit manner based on the PDCCH carrying scheduling information for the PDSCH carrying corresponding downlink data.
  • the entire region in which the PDCCH is transmitted in each DL subframe consists of a plurality of control channel elements (CCEs), and the PDCCH transmitted to the UE consists of one or more CCEs.
  • the CCE includes a plurality (eg, nine) Resource Element Groups (REGs).
  • One REG is composed of four neighboring REs (RE) except for a reference signal (RS).
  • the UE uses an implicit PUCCH resource derived or calculated by a function of a specific CCE index (eg, the first or lowest CCE index) among the indexes of the CCEs constituting the PDCCH received by the UE.
  • Send ACK / NACK is a specific CCE index (eg, the first or lowest CCE index) among the indexes of the CCEs constituting the PDCCH received by the UE.
  • each PUCCH resource index is treated with a PUCCH resource for ACK / NACK.
  • the UE is derived from an index of 4 CCEs, which is the lowest CCE constituting the PDCCH.
  • Calculated PUCCH for example 4 times
  • the ACK / NACK is transmitted to the BS through the PUCCH.
  • 10 illustrates a case in which up to M ′ CCEs exist in a DL and up to M PUCCHs exist in a UL. Although it may be 3 ⁇ 41 ', the M' value and the M value are designed differently, and the mapping of the CCE and PUCCH resources may be overlapped.
  • the PUCCH resource index may be determined as follows.
  • n (1) PUCCH represents a PUCCH resource index for ACK / NACK transmission
  • N (1) PUCCH represents a signaling value received from the upper layer.
  • n CCE may indicate the smallest value among the CCE indexes used for PDCCH transmission.
  • the PUCCH formats la and lb are described first.
  • a symbol modulated using the BPSK or QPSK modulation scheme is multiply multiplied by a length 12 CAZAC sequence.
  • the y (0) and y (N ⁇ 1) symbols may be referred to as a block of symbol.
  • a Hadamard sequence of length 4 is used for general ACK / NACK information, and a Discrete Fourier Transform (DFT) sequence of length 3 is used for shortened ACK / NACK information and a reference signal.
  • a Hadamard sequence of length 2 is used for the reference signal in the case of an extended CP.
  • 11 shows a structure of an ACK / NACK channel in case of a normal CP.
  • 11 exemplarily shows a PUCCH channel structure for HARQ ACK / NACK transmission without CQI.
  • a reference signal (RS) is carried on three consecutive SC-FDMA symbols in the middle of seven SC-FDMA symbols included in one slot, and an ACK / NACK signal is carried on the remaining four SC-FDMA symbols.
  • RS may be carried in two consecutive symbols in the middle.
  • the number and location of symbols used for RS can vary depending on the control channel. The number and location of symbols used in the associated ACK / NACK signal may also be changed accordingly.
  • 1 bit and 2 bit acknowledgment information may be represented by one HARQ ACK / NACK modulation symbol using BPSK and QPS modulation techniques, respectively.
  • the positive acknowledgment (ACK) may be encoded as '1'
  • the negative acknowledgment (NACK) may be encoded as '0'.
  • two-dimensional spreading is applied to increase the multiplexing capacity. That is, frequency domain spreading and time domain spreading are simultaneously applied to increase the number of terminals or control channels that can be multiplexed.
  • the frequency domain sequence is used as the basic sequence.
  • a frequency domain sequence may use a Zadoff-Chu (ZC) sequence, one of the CAZAC sequences.
  • ZC Zadoff-Chu
  • CS cyclic shifts
  • the number of CS resources supported in an SC-FDMA symbol for PUCCH RBs for HARQ ACK / NACK transmission is cell—specific high-layer signaling ⁇ PUCCH * PUCCH
  • the frequency domain spread ACK / NACK signal is spread in the time domain using an orthogonal spreading code.
  • an orthogonal spreading code a Walsh-Hadamard sequence or a DFT sequence may be used.
  • the ACK / NACK signal may be spread using an orthogonal sequence of length 4 (w0, wl, w2, w3) for 4 symbols.
  • RS is also spread through an orthogonal sequence of length 3 or length 2. This is called orthogonal covering (0C).
  • a plurality of terminals may be multiplexed in a code division multiplex (CDM) scheme. That is, ACK / NACK information and RS of a large number of terminals may be multiplexed on the same PUCCH RB.
  • CDM code division multiplex
  • the number of spreading codes supported for ACK / NACK information is limited by the number of RS symbols. That is, since the number of RS transmission SC-FDMA symbols is smaller than the number of ACK / NACK information transmission SC-FDMA symbols, the multiplexing capacity of the RS is smaller than that of the ACK / NACK information.
  • ACK / NACK information may be transmitted in four symbols.
  • three orthogonal spreading codes are used instead of four, which means that the number of RS transmission symbols is three. This is because only three orthogonal spreading codes can be used for the RS.
  • Tables 2 and 3 Examples of orthogonal sequences used for spreading ACK / NACK information are shown in Tables 2 and 3.
  • Table 2 shows the sequences for 4 symbols in length and Table 3 shows the sequences for 3 symbols in length.
  • the sequence for the length 4 symbol is used in PUCCH format 1 / la / lb of a general subframe configuration. In the subframe configuration, a Sounding Reference Signal (SRS) is transmitted in the last symbol of the second slot .
  • SRS Sounding Reference Signal
  • a sequence for a length 4 symbol is applied in the first slot, and a shortened PUCCH format 1 / la / lb of a sequence for a length 3 ⁇ symbol may be applied in the second slot.
  • HARQ acknowledgment responses from a total of 18 different terminals may be multiplexed in one PUCCH RB.
  • the scheduling request is a terminal It is sent in a manner that requires or does not request to be scheduled.
  • the SR channel reuses the ACK / NACK channel structure in the PUCCH format la / lb and is configured in a 00K (0n-0ff Keying) scheme based on the ACK / NACK channel design. Reference signals are not transmitted in the SR channel. Therefore, a length 7 sequence is used for a general CP and a length 6 sequence is used for an extended CP. Different cyclic shifts or orthogonal covers may be assigned for SR and ACK / NACK.
  • the UE transmits HARQ ACK / NACK through all resources allocated for the SR.
  • the UE transmits HARQ ACK / NACK through a resource allocated for ACK / NACK.
  • PUCCH format 2 / 2a / 2b is a control channel for transmitting channel measurement feedback (CQI, PMI, RI).
  • the reporting period of the channel measurement feedback (hereinafter collectively referred to as CQI information) and the frequency unit (or frequency resolution) to be measured may be controlled by the base station / periodic and aperiodic CQI reporting in the time domain. Can be supported. PUCCH format 2 may be used only for periodic reporting and PUSCH may be used for aperiodic reporting. In the case of aperiodic reporting, the base station may instruct the terminal to transmit an individual CQI report on a resource scheduled for uplink data transmission.
  • SC-FDMA symbol 3 SC-FDMA symbol 3
  • SC-FDMA symbol 3 SC-FDMA symbol 3
  • PUCCH format 2 / 2a / 2b modulation by a CAZAC sequence is supported, and a QPSK modulated symbol is multiplied by a length 12 CAZAC sequence.
  • the cyclic shift (CS) of the sequence is changed between the symbol and the slot. Orthogonal covering is used for DMRS.
  • each terminal is distinguished using a cyclic shift (CS) sequence.
  • the CQI information symbols are modulated and transmitted in the entire SC-FDMA symbol, and the SOFDMA symbol is composed of one sequence. That is, the terminal modulates and transmits the CQI in each sequence.
  • the number of symbols that can be transmitted in one ⁇ is 10, and modulation of the CQI information is determined up to QPSK.
  • QPSK mapping is used for an SC-FDMA symbol, a 2-bit CQI value may be carried, and thus a 10-bit CQI value may be loaded in one slot. Therefore, a CQI value of up to 20 bits can be loaded in one subframe.
  • a frequency domain spread code is used to spread the CQI information in the frequency domain.
  • a CAZAC sequence (eg, a ZC sequence) having a length of -12 may be used.
  • Each control channel may be distinguished by applying a CAZAC sequence having a different cyclic shift value.
  • IFFT is performed on the frequency domain spread CQI information.
  • PUCCH Resource Index (Semi-statically) may be set by higher layer signaling to periodically report different CQI, PMI, and RI types on the PUCCH resource indicated by Pf / ccO, where PUCCH Resource Index ( ) Is information indicating a PUCCH region used for p UCCH format 2 / 2a / 2b transmission and a cyclic shift (CS) value to be used.
  • the improved -PUCCH (e-PUCCH) format will be described.
  • the e-PUCCH may correspond to PUCCH format 3 of the LTE-A system.
  • Block spreading may be applied to ACK / NACK transmission using PUCCH format 3.
  • the block spreading technique unlike the conventional PUCCH format 1 series or 2 series, controls signal Transmission is modulated using SC-FIMA method. As shown in FIG. 13, a symbol sequence may be spread and transmitted on a time domain using an orthogonal cover code (0CC). By using 0CC, control signals of a plurality of terminals may be multiplexed on the same RB.
  • one symbol sequence is transmitted over a time domain and control signals of a plurality of terminals are multiplexed using a CS cyclic shift of a CAZAC sequence
  • a block spreading based PUCCH format eg, In the case of PUCCH format 3
  • one symbol sequence is transmitted over a frequency domain, and control signals of a plurality of terminals are multiplexed using time-domain spreading using 0CC.
  • an RS symbol may be generated from a CAZAC sequence to which a specific cyclic shift value is applied, and may be transmitted in a form in which a predetermined 0 CC is applied (or multiplied) over a plurality of RS symbols.
  • control information having an extended size can be transmitted as compared to the PUCCH format 1 series and 2 series.
  • a cell may be understood as a combination of downlink resources and uplink resources.
  • the uplink resource is not an essential element, and therefore, the sal may be composed of the downlink resource alone or the downlink resource and the uplink resource.
  • the downlink resource may be referred to as a downlink component carrier (DL CC) and the uplink resource may be referred to as an uplink component carrier (UL CC).
  • DL CC and UL CC may be represented by a carrier frequency (carrier frequency), the carrier frequency means a center frequency (center frequency) in the cell.
  • Sal may be classified into a primary cell (PCell) operating at the primary frequency (primary frequency) and a secondary cell (SCell) operating at the secondary frequency (secondary frequency).
  • PCell and SCell may be collectively referred to as a serving cell.
  • the terminal may perform an initial connection establishment (initial connection establishment) process, or the cell indicated in the connection reset process or handover process may be a PCell. That is, the PCell may be understood as a cell which is a control-related core in a carrier aggregation environment which will be described later.
  • the UE may receive and transmit a PUCCH in its PCell.
  • the SCell is configurable after the Radio Resource Control (RRC) connection is established and can be used to provide additional radio resources.
  • RRC Radio Resource Control
  • the network may configure one or more SCells in addition to a PCell initially configured in a connection establishment process after an initial security activation process is initiated.
  • Carrier aggregation is high It is a technology introduced to use a wider band to meet the demand for high speed transmission.
  • Carrier aggregation may be defined as an aggregation of two or more component carriers (CCs) having different carrier frequencies.
  • FIG. 14A illustrates a subframe when one CC is used in an existing LTE system
  • FIG. 14B illustrates a subframe when carrier aggregation is used.
  • three CCs of 20 MHz are used to support a total bandwidth of 60 MHz.
  • each CC may be continuous or may be non-continuous.
  • the terminal may simultaneously receive and monitor downlink data through a plurality of DL CCs.
  • the linkage between each DLCC and ULCC may be indicated by system information.
  • the DL CC / UL CC link may be fixed in the system or configured semi-statically.
  • the frequency band that can be monitored / received by a specific terminal may be limited to M ( ⁇ N) CCs.
  • Various parameters for carrier aggregation may be set in a cell-specific, UE group-specific or UE-specific manner.
  • Cross-carrier scheduling means, for example, including all downlink scheduling allocation information of another DL CC in a control region of one DL CC among a plurality of serving cells, or one DL CC of a plurality of serving cells. This means that the uplink scheduling grant information for the plurality of UL CCs linked with the DL CC is included in the control region of the UE.
  • the CIF may be included or not included in the DCI format transmitted through the PDCCH, and when included, it indicates that the cross carrier scheduling is applied.
  • downlink scheduling allocation information is valid on a DL CC through which current downlink scheduling allocation information is transmitted.
  • the uplink scheduling grant is also valid for one UL CC linked with the DL CC through which the downlink scheduling assignment information is transmitted.
  • the CIF indicates a CC related to downlink scheduling allocation information transmitted through a PDCCH in one DL CC. For example, referring to FIG.
  • downlink allocation information about DL CC B and DL CC C that is, information about PDSCH resources, is transmitted through a PDCCH in a control region on DLCCA.
  • the UE monitors the DL CC A to know the resource region of the PDSCH and the corresponding CC through the CIF.
  • the PDCCH on a specific DL CC may allocate PDSCH resources on the same DL CC and may allocate PUSCH resources on a UL CC linked to a specific DLCC.
  • the same coding scheme, CCE-based resource mapping, DCI format, and the like as the existing PDCCH structure may be applied.
  • the PDCCH on a specific DL CC may allocate PDSCH / PUSCH resources on one DL / UL CC indicated by the CIF among a plurality of merged CCs.
  • the CIF may be additionally defined in the existing PDCCH DCI format, may be defined as a fixed 3-bit field, or the CIF position may be fixed regardless of the DCI format ' size.
  • the same coding scheme, CCE-based resource mapping, DCI format, and the like as the existing PDCCH structure may be applied.
  • the base station may allocate a DLCC set for monitoring the PDCCH. Accordingly, the burden of blind decoding of the terminal can be reduced.
  • the PDCCH monitoring CC set is a part of the total merged DL CCs and the UE may perform detection / decoding of the PDCCH only in the corresponding CC set. That is, in order to schedule PDSCH / PUSCH for the terminal, the base station may transmit the PDCCH to the PDCCH monitoring (X set only.
  • the PDCCH monitoring DL CC set may be configured as UE-specific or UE group-specific or cell-specific. For example, when three DL CCs are merged as shown in the example of Fig.
  • DL CC A may be set to a PDCCH monitoring DL CC, and when CIF is deactivated, the PDCCH on each DL CC is Only PDSCH can be scheduled in DLCC A. On the other hand, if CIF is activated, the PDCCH on DLCC A can schedule not only DLCC A but also PDSCH in another DLCC.
  • DL CC A is set to PDCCH monitoring CC, PDSCCH is not transmitted to DL CC B and DL CC C.
  • the UE may receive a plurality of PDSCHs through a plurality of downlink carriers. In this case, the UE performs one ACK / NACK for each data in one subframe. There is a case that needs to be transmitted on the UL CC. In case of transmitting a plurality of ACK / NACKs in one subframe using PUCCH format la / lb, high transmission power is required, PAPR of uplink transmission is increased, and inefficient use of a transmission power amplifier is performed. The transmittable distance from can be reduced. In order to transmit a plurality of ACK / NACK through one PUCCH, ACK / NACK bundling or ACK / NACK multiplexing may be applied.
  • ACK / NACK information for a large number of downlink data and / or a large number of downlink data transmitted in a plurality of DL subframes in a TDD system is transmitted through a PUCCH in one subframe according to carrier aggregation. Cases may arise. In this case, if the number of ACK / NACK bits to be transmitted is larger than the number that can be supported by ACK / NACK bundling or multiplexing, the above methods cannot correctly transmit ACK / NACK information.
  • the contents of the ACK / NACK answer for a plurality of data units depend on the combination of one of the ACK / NACK unit and QPSK modulated symbols used in the actual ACK / NACK transmission. Can be identified. For example, it is assumed that one ACK / NACK unit carries two bits of information, and it is assumed that a maximum of two data units are received. Here, it is assumed that the HARQ acknowledgment answer for each received data unit is represented by one ACK / NACK bit. In this case, the transmitting end transmitting the data may identify the ACK / NACK results as shown in Table 5 below. Table 5
  • DTX Discontinuous Transmission
  • PUCCH'X represents an ACK / NACK unit used for actual ACK / NACK transmission. If there are up to two ACK / NACK units, they can be represented by "Pucc o and" PUCCH.I ')
  • (1) represents two bits transmitted by the selected ACK / NACK unit. The modulation symbol transmitted through the ACK / NACK unit is determined according to the bits ⁇ ) 0 ) and ⁇ 1 ).
  • the receiving end transmits two bits (1, 1) using the ACK / NACK unit ⁇ 1 .
  • the receiving end fails to decode (or detect) the first data unit (ie, data unit 0 corresponding to HARQ-ACK (O)) and the second data unit (ie, If decoding of data unit 1 corresponding to HARQ-ACK (l) is successful (i.e., in case of NACK / DTX and ACK of Table 5), the receiving end uses two bits using ACK / NACK unit ⁇ UCCH ' 1 . (0,0) send all.
  • the combination of selection of the ACK / NACK unit and actual bit contents of the transmitted ACK / NACK unit that is, selecting one of npuc CH'o or PUCCH'I from Table 5 above (0), ⁇ (1 By linking or mapping)
  • the contents of actual ACK / NACK it is possible to transmit ACK / NACK information for a plurality of data units using one ACK / NACK unit.
  • ACK / NACK multiplexing By extending the above-described principles of ACK / NACK multiplexing as it is, ACK / NACK multiplexing for more than 2 data units can be easily implemented.
  • NACK and DTX may not be distinguished (that is, as represented by NACK / DTX in Table 5 above). NACK and DTX may be coupled). Because all ACK / NACK states (i.e., ACK / NACK hypotheses) that can occur when you want to express NACK and DTX separately, can be reflected only by the combination of ACK / NACK unit and QPSK modulated symbols. Because there is not.
  • NACK i.e., if only NACK or DTX exists for all data units
  • NACK i.e.
  • One definite NACK case may be defined, indicating a distinct NACK.
  • an ACK / NACK unit that speaks to a data unit corresponding to one certain NACK may be reserved for transmitting signals of a plurality of ACK / NACKs.
  • SPS Semi-persistent scheduling
  • RRC Radio Resource Control
  • the SPS activation PDCCH when the SPS activation PDCCH is received, the frequency resource according to the RB allocation designated in the PDCCH is allocated, the modulation and coding rate according to the MCS information is applied, and TX / RX is performed with the subframe period and offset allocated by the RRC signaling. You can start doing it. Meanwhile, upon receiving the PDCCH indicating the release of the SPS, the UE stops TX / RX. When the suspended SPS TX / RX receives a PDCCH indicating activation (or reactivation), the SPS TX / RX may resume TX / RX again with the subframe period and offset allocated by RRC signaling according to the RB allocation, MCS, etc. specified in the PDCCH. have.
  • PDCCH format defined in 3GPP LTE currently defines various formats such as DCI format 0 for uplink and DCI formats 1, 1A, IB, 1C, ID, 2, 2k, 3, and 3A for downlink. Hopping flag, RB allocation, MCSCmodulat ion coding scheme (RV), redundancy version (NDV), NDKnew data indicator (TPC), transmit power control (TPC), demodulat ion reference signal (DMRS), UL index, CQI (channel quality) information) request, DL assignment index, HARQ process number, TPMKtransmitted precoding matrix indicator (PPM), and precoding matrix indicator (PMI) confirmation are transmitted in a selected combination.
  • DCI format 0 for uplink and DCI formats 1, 1A, IB, 1C, ID, 2, 2k, 3, and 3A for downlink.
  • the combination of bit fields is set to 0 and used as a virtual CRC as shown in Table 6 below.
  • Cyclic shift DMRS set to N / A N / A
  • Modulation and coding MSB is set to N / A N / A
  • MSB is set to '0'
  • the virtual CRC has additional error detection capability by checking whether or not the corresponding bit field value is a promised value when an error that cannot be checked by the CRC occurs. If an error occurs in the DCI assigned to another UE, but a specific UE does not detect the error and misrecognizes it as its own SPS activation, one error causes a continuous problem because the resource is continuously used. Therefore, the use of virtual CRC prevents false detection of SPS.
  • PAPR Peak-to-Average Power Ratio
  • CM Cubic Metric
  • UCKuplink control information information to be transmitted through the PUCCH is transmitted along with data through the PUSCH.
  • a method of multiplexing UCKCQI / PMI, HARQ-ACK, RI, etc.) in a PUSCH region is used in a subframe in which the PUSCH is transmitted.
  • UL-SCH data and CQI / PMI may be multiplexed before DFT_spreading to transmit control information and data together.
  • UL-SCH data performs rate-matching in consideration of CQI / PMI resources.
  • control information such as HARQ ACK and RI may be multiplexed in a PUSCH region by puncturing UL—SCH data.
  • 17 is a diagram illustrating a multiplexing process of data and control information for uplink transmission.
  • the data information multiplexed together with the control information is a transport block (hereinafter, referred to as "TB") which must be transmitted in the uplink (a 0l a 1; ..., a ⁇ l CRC for TB After attaching (Cyclic Redundancy Check), it is divided into several code blocks (CBs) according to TB size, and CRCs for Cfe are attached to several CBs.
  • CBs code blocks
  • combining between CBs is performed again, and the combined CBs are then multiplexed with a control signal.
  • channel encoding is performed separately from the data of CQI / PMI (0 0 , 01 ,).
  • the channel-coded CQI / PMI is multiplexed with the data.
  • the CQI / PMI information and the multiplexed data are channels It is input to the interleaver.
  • the rank information ([o 0 RI ] or [o 0 RI o 1 ]) is also subjected to channel encoding separately from the data (S511).
  • the channel coded tank information is inserted into a part of the interleaved signal through a process such as puncturing.
  • channel coding is performed separately from data, CQI / PMI and tank information.
  • the channel-coded ACK / NACK information is inserted into a part of the interleaved signal through a process such as puncturing.
  • CCE control channel element
  • One CCE includes a plurality of (eg, nine) resource element groups (REGs), and one REG is composed of four neighboring REs except for the reference signal RS.
  • the number of CCEs required for a specific PDCCH depends on the DCI payload, cell bandwidth, channel coding rate, and the like, which are control information sizes. In more detail, the number of CCEs for a specific PDCCH may be defined according to the PDCCH format as shown in Table 8 below.
  • the PDCCH may use any one of four formats, which is unknown to the UE. Therefore, the UE should decode without knowing the PDCCH format, which is called blind decoding. However, since it is a heavy burden for the UE to decode all possible CCEs used for downlink for each PDCCH format, considering the scheduler limitation and the number of decoding attempts. Search Space is defined.
  • the search space is a set of candidate PDCCHs consisting of CCEs that the UE should attempt to decode on an aggregation level.
  • the aggregation level and the number of PDCCH candidates may be defined as shown in Table 9 below.
  • the terminal has a plurality of search spaces according to each aggregation level.
  • the search space may be divided into a terminal specific search space and a common search space.
  • the UE-specific discovery space is for specific UEs, and each UE monitors the UE-specific discovery space (attempting to decode a PDCCH candidate set according to a possible DCI format) to check the RNTI and CRC masked on the PDCCH. Control information can be obtained.
  • the common search space is for a case where a plurality of terminals or all terminals need to receive the PDCCH, such as dynamic scheduling or paging message for system information.
  • the common search space may be used for a specific terminal for resource management.
  • the common search space may overlap with the terminal specific search space.
  • a downlink control channel other than the PDCCH for example, e-PDCCH (ex tended PDCCH) Or R-PDCCH (Relay-PDCCH) can be applied.
  • the e-PDCCH corresponds to an extended form of a control channel carrying a DCI for a UE and may be introduced to effectively support techniques such as inter-cell interference coordination (ICIC), CoMP, MU-MIM0, and the like.
  • the R-PDCCH corresponds to a control channel carrying a DCI for a relay.
  • This e—PDCCH and / or R-PDCCH is existing in that it is allocated to the time-frequency resource region except for the region (for example, the control region of FIG. 3) defined for PDCCH transmission in the existing LTE / LTE-A system. Is distinguished from PDCCH.
  • the R-PDCCH may be transmitted on an eNB-to—RN transmission region (see 1022 of FIG. 8) as described with reference to FIG. 8.
  • the e-PDCCH also has a feature of being transmitted in an existing data area (see FIG. 3).
  • FIG. 18 is a diagram for describing resource element mapping of an e-PDCCH. The same description can be applied to the R-PDCCH.
  • the e-PDCCH is transmitted in the data region of the downlink subframe in the time domain (corresponding to the region except for the PDCCH, PCFICH, and PHICH regions in FIG. 18), and is semi-statically allocated in the frequency domain. It can be transmitted on a set of resource blocks (RBs).
  • the e-PDCCH carrying DCI for DL assignment carries the DCI for UL grant in the first slot.
  • e PDCCH may be mapped on a second slot.
  • the PDSCH may be mapped on the first and second slots in a specific frequency region of the data region of the downlink subframe.
  • the search for the e-PDCCH and / or R-PDCCH is different from the search space setting for the existing PDCCH. New settings of the space need to be prepared.
  • a PDCCH transmitted in an area other than the existing PDCCH transmission area (for example, the data area of FIG. 3), such as an e-PDCCH or an R-PDCCH, is collectively called an e-PDCCH. That is, the principle of the present invention for describing the e-PDCCH is equally applicable to the R-PDCCH and the new PDCCH.
  • FIG. 19 shows an example in which e—PDCCH cross interleaving is not applied.
  • 20 shows an example in which e-PDCCH cross interleaving is applied. The same descriptions for FIG. 19 and FIG. 20 may be applied to the R-PDCCH.
  • one e-PDCCH may be mapped to a specific set of resource blocks, and the number of resource blocks constituting the set of resource blocks is an aggregation level. One, two, four or eight. Other e—PDCCH is not transmitted in the corresponding resource block set.
  • RS may be determined. For example, e-PDCCH when the cross-interleaving is applied to the same, because resource blocks are shared for the plurality of e-PDCCH transmission, the demodulated e -PDCCH Only CRS can be used for this purpose. This is because the CRS is common in one cell even if the UEs receiving the respective e-PDCCHs are different. In other words, in the case of e-PDCCH cross interleaving, UE-specific DMRS cannot be used for e-PDCCH demodulation. On the other hand, when e-PDCCH cross interleaving is not applied, CRS or DMRS may be used for e-PDCCH demodulation.
  • the RB set monitored by the UE may be set by signaling an RB set (or a virtual resource block (VRB) set) using resource allocation types 1 and 2 by the base station.
  • Resource allocation type 0 is a method in which resource allocation is performed in units of RBGs (resource block group, one RBG is composed of a predetermined number of consecutive PRBs).
  • Resource allocation type 1 is a manner in which all RBGs are grouped into RBG subsets and PRBs are allocated to UEs in the selected RBG subset.
  • Resource allocation type 2 is a manner in which PRBs are not directly allocated, but virtual resource blocks (VRBs) are allocated instead, and VBs are mapped to PRBs .
  • VRB is a logical resource
  • PRB is a physical resource.
  • the VRB index and the PRB index may have a 1-to-1 mapping relationship, and the VRB-to-PRB mapping relationship may be determined according to a predetermined rule.
  • an RB (or VRB) set for e-PDCCH monitoring may or may not overlap between terminals.
  • the UE may attempt to receive and decode each of the e-PDCCH candidates.
  • the UE finds the DCI in the search space the corresponding information may be used for downlink reception or uplink transmission.
  • the e-PDCCH blind decoding process may be performed similar to the general PDCCH blind decoding except for the configuration for the search space.
  • the number of e—PDCCH candidates is 6, 6, 2, and 2 for combination levels 1, 2, 4, and 8, respectively, as in the UE-specific search space of Table 9 above.
  • channel estimation for existing PDCCH demodulation is based on CRS which is RS transmitted in the same region as PDCCH
  • channel estimation for demodulation of e-PDCCH may be based on CRS or DMRS as described above.
  • Table 10 below lists RSs used for e-PDCCH demodulation (hereinafter referred to as e ⁇ PDCCHRS) and RSs used for PDSCH demodulation (ie, PDSCH RS).
  • e ⁇ PDCCHRS RSs used for PDSCH demodulation
  • PDSCH RS RSs used for PDSCH demodulation
  • CRS is not used for demodulation of PDSCH while DMRS is used as e-PDCCH RS
  • beamforming using DMRS is not used for PDSCH when beamforming using DMRS is used for e-PDCCH. This is because it is not desirable. That is, it is generally advantageous to apply the same precoding to the e ⁇ PDCCH and PDSCH.
  • whether cross interleaving is applied and / or what is an e-PDCCH RS may be configured through higher layer signaling (eg, RRC signaling).
  • the search space setting may be defined according to whether cross interleaving is applied to the e-PDCCH and whether the e-PDCCH RS is a CRS or a DMRS.
  • a search space configuration may be defined in consideration of whether cross interleaving is applied to each carrier (or cell) and / or what is an e-PDCCH RS.
  • Table 11 shows a case where different e-PDCCH RSs are configured for each carrier (or cell). In the example of Table 11, it is assumed that cross interleaving is applied when the e-PDCCH RS is CRS.
  • Cell 1 CRS ON 2 sets (DL, UL)
  • the e-PDCCH SS may be configured as one VRB set. This is because the VRB set for potential e-PDCCH transmission in the first and second slots is set to be the same when cross interleaving is not applied.
  • One e-PDCCH SS (eg, a set of VRBs for potential e-PDCCH transmission) may be configured to the terminal through higher layer signaling. That is, when two V B sets are configured, two higher layer signaling (or one higher layer signaling including two higher tradeoff signaling parameters) may be used.
  • e-PDCCH RS is set to DMRS for all carriers, or if e-PDCCH RS is set to CRS and a unified cross interleaving setting is applied for all carriers (i.e., cross interleaving is applied on all carriers, or Or, if not applied), one higher layer signaling (or one higher layer signaling parameter) may be used to configure the e-PDCCH SS for all carriers. Otherwise, it is necessary to signal the configuration of the e-PDCCH SS for each carrier (or for each carrier group).
  • Table 12 shows a case in which different e—PDCCH RSs are configured for each carrier (or cell). Indicates. In the example of Table 12, it is assumed that cross interleaving 0 is not applied when the e-PDCCH RS is CRS.
  • the e-PDCCH SS may be set to one VRB set.
  • the e-PDCCH SS may be configured using only one higher layer signaling (or one higher layer parameter) for each cell.
  • the e-PDCCH SS may be configured using one higher layer signaling (or one higher layer parameter) in common to all cells.
  • e-PDCCH SS signaling may be referred to as signaling that indicates what B set there is a potential e-PDCCH transmission.
  • the plurality of e-PDCCH SS signaling may correspond to a form in which a plurality of e-PDCCH SS configuration parameters are included in one higher layer signaling, or a plurality of higher layer signaling each including an e -PDCCH SS configuration parameter. have.
  • the overhead of higher layer signaling (eg, RRC signaling) required for each cell may vary. have.
  • RRC signaling e.g, RRC signaling
  • the overhead of e-PDCCH SS signaling may be determined from the number of cells to which cross interleaving is applied and the number of cells to which cross interleaving is not applied.
  • the overhead of e-PDCCH SS signaling is the number of cells to which cross interleaving is applied (# — It may correspond to a value obtained by multiplying eel l_cross-inter leaving by 2 and the number of cells (# _cell_non-cross-interleaving) to which cross interleaving is not applied.
  • the SS configuration signaling may also be different for each terminal.
  • the same e-PDCCH RS is configured for all carriers (or cells). For example, if the e-PDCCH RS is set to DMRS for all Cells, it can be designed to configure SS for DL allocation and UL grant in all Cells using one RRC signaling.
  • the signaling method may vary depending on whether cross interleaving is applied.
  • e-PDCCH SS signaling having signaling overhead as many as the number of cells may be performed. To further reduce the signaling overhead, for every cell When configuring the same e-PDCCH SS VRB set, one e-PDCCH SS signaling may be used for all cells.
  • SS VRB set for DL allocation in the first slot and UL grant for the second slot are used.
  • SS VRB set should be informed separately).
  • one e-PDCCH SS signaling indicates the DL allocation SS VRB set of the first slot in all cells, and the other e-PDCCH SS signaling indicates the second slot of all the cells.
  • a method of notifying the UL grant SS VRB set may be applied.
  • the e-PDCCH SS (e.g., DL allocation SS VRB set) in each first slot of all Cells is set identically and the e-PDCCH in each second slot of all Cells.
  • the SS (eg UL Grant SS VRB set) can be set identically.
  • FIG. 22 is a diagram for describing examples of the present invention for reducing overhead of e-PDCCH SS signaling.
  • FIG. 22 illustrates various examples of reducing signaling overhead of e-PDCCH SS configuration by signaling a common VRB set for a plurality of cells.
  • a VRB set other than the VRB set in which DL / UL SS for a plurality of cells is set may be set as a VRB set for PDSCH transmission.
  • the SS order and size of FIG. 22 are for illustration only, and in practice, various VRB set sizes may be set at various locations according to the scheduler.
  • FIG. 22A illustrates a method of signaling an e-PDCCH SS configuration without distinguishing a cell or a DL / UL SS.
  • DL allocation SS in Cell 1 and Cell 2 using one RRC signaling e.g., a set of VRBs in which potential e—PDCCH is transmitted in G.1 slot
  • UL grant SS e.g.
  • the UE may inform the UE of the configuration of the common VRB set for the VRB set in which the potential e-PDCCH is transmitted in the second slot.
  • cross interleaving is not applied, and may correspond to a case where CRS or DMRS is used as an e-PDCCH RS in both Cell 1 and Cell 2, but is not limited thereto.
  • a cell is not distinguished, but a method of distinguishing and signaling a DL SS and a UL SS is shown.
  • the RRC signaling # 1 may be used to inform the user equipment of a common VRB set for the DL allocation SS in Cell 1 and Cell 2.
  • the RRC signaling # 2 may inform the UE of setting of a common VRB set for the UL grant SS in Cell 1 and Cell 2.
  • cross-interleaving may be applied, and CRS may be used as an e-PDCCH RS in both Cell 1 and Cell 2, but is not limited thereto.
  • a method of signaling a cell by distinguishing a cell and further distinguishing a DL SS and a UL SS is signaled.
  • RC signaling # 1 may inform the UE of the configuration of the DL allocation SS VRB set in Cell 1.
  • RRC signaling # 2 may inform the UE of the configuration of the DL allocation SS VB set in Cell 2.
  • ' RRC signaling # 3 may inform the UE of the setting of the UL grant SS VRB set in Cell 2.
  • RC signaling # 4 may inform the UE of the setting of the UL grant SSVRB set in Cell 2. have.
  • the example of FIG. 22 (c) may correspond to a case where cross interleaving is applied and different e-PDCCH RSs are configured in Cell 1 and Cell 2, but is not limited thereto.
  • RRC signaling # 1 may inform the UE of setting of common VRB set for DL allocation SSVRB set and UL grant SS in Cell 1.
  • the RRC signaling # 1 may inform the UE of the configuration of the common VRB set for the DL allocation SSVRB set and the UL grant SS in the Cell 2.
  • the example of FIG. 22 (d) may correspond to a case where different e-PDCCH RSs are configured in Cell 1 and Cell 2 without cross interleaving, but are not limited thereto.
  • the corresponding VRB set may be interpreted differently for each cell.
  • the PRB set in each cell mapped to the common VRB set may be determined by interpreting the common VRB set according to the index of the cell or according to a rule based on the cell index.
  • the e-PDCCH SS configuration may be separately signaled for each cell.
  • the size of the VB set may be different for each cell.
  • a method of reducing signaling overhead by applying a configuration of a parameter (e.g., a VRB set) for e-PDCCH SS configuration signaling in common to a plurality of cells may be applied to the following parameters.
  • a parameter e.g., a VRB set
  • a specific time-frequency among parameters set by higher layer signaling for example, RRC signaling
  • RRC signaling for example, RRC signaling
  • the subframeConfigurationPatternFDD parameter is a bitmap format information indicating a subframe set for a specific terminal or repeater in the case of FDD.
  • the subframeConfigurationPatternTDD parameter is index information indicating a subframe for a specific terminal or repeater in the case of TDD.
  • the resourceAllocationType parameter indicates a resource allocation method for e-PDCCH SS signaling and mapping. Information.
  • the resourceBlockAssignment parameter is information of a bitmap format for e-PDCCH SS signaling.
  • the demodulationRS parameter is information indicating what reference signal is used for e—PDCCH demodulation.
  • the pdsch-Start parameter is information indicating a symbol position at which the PDSCH region starts.
  • the pucch-Config parameter is information indicating a PUCCH ACK / NACK resource reservation by a higher layer.
  • the parameters set by the aforementioned RRC signaling for a plurality of cells may be dynamically applied depending on whether the corresponding cell is activated or deactivated.
  • the corresponding parameter may be interpreted to apply only to an activated cell.
  • it may be assumed that Cell 1, Cell 2, Cell 4, and Cell 5 are configured for a specific terminal, and in case of RRC: Only Cell 1 and Cell 4 are activated at the moment of receiving the nulling. In this case, except for the deactivated Cell 2 and Cell 5, the common VRB set for the e-PDCCH SS can be applied only to the activated Cell 1 and Cell 4.
  • the above-described overhead reduction scheme of higher layer signaling may be applied to a terminal after initial access, and in the case of a repeater, such a restriction may not be applied.
  • the above-described examples of the present invention are directed to a specific space for which a specific time-frequency resource is set for a specific purpose in a system supporting carrier aggregation (for example, a search space in which a specific time-frequency resource is used for potential e-PDCCH transmission.
  • a system supporting carrier aggregation for example, a search space in which a specific time-frequency resource is used for potential e-PDCCH transmission.
  • the method can reduce the signaling overhead.
  • examples of the present invention for mapping an e-PDCCH onto a physical resource according to whether or not cross carrier scheduling (CCS) is applied in a carrier aggregation system will be described.
  • CCS cross carrier scheduling
  • CCS is a DCI for the other cell on any one of the plurality of serving cells It can be defined as being transmitted. For example, when CCS is applied, the DCI for SCelKs) may be transmitted only on the PCell. Meanwhile, when CCS is not applied, DCI for a specific cell may be transmitted only on the corresponding cell.
  • an e-PDCCH search space may be configured on a specific CelK (eg, PCell), and a VRB set for one cell may be signaled for this purpose.
  • VRB sets ie, SS WB sets
  • the search space may be configured according to whether e-PDCCH cross interleaving is applied. For example, when e-PDCCH cross interleaving is not applied, an e-PDCCH search space may be configured based on DMRS, and when cross interleaving is applied, a CRS based e-PDCCH search space may be configured.
  • an e-PDCCH search space may be configured on a resource region occupied by each cell, and for this purpose, a VRB set may be signaled for each cell. It can also be expressed as being mapped to a PRB set of cells.
  • the bit length of SS VRB set signaling may also be different for each cell.
  • the number of SS VRBs set for each cell is not directly related to the system bandwidth, when the system bandwidth is different, the resource region corresponding to the search space may be set to have a different size.
  • subframeConf igurat ionPatternFDD subframeConf igurationPatter nTDD
  • resourceAl locat ionType resourceBlockAssignment
  • demodulat ionRS demodulat ionRS
  • FIGS. 23 to 29 various examples of mapping an e-PDCCH search space onto a physical resource will be described with reference to FIGS. 23 to 29.
  • FIGS. 23 to 29 it is assumed that five cells are set for the UE, Cell 1 is set to PCell, and the remaining Cells 2 to 5 are set to SCell.
  • the assignment of the SS is given in logical units (ie VRB set), and the PRB set to which the VRB set is mapped represents the physical time-frequency resource where potential e-PDCCH transmission may exist.
  • FIGS. 23 to 29 it is assumed that five cells are set for the UE, Cell 1 is set to PCell, and the remaining Cells 2 to 5 are set to SCell.
  • the assignment of the SS is given in logical units (ie VRB set), and the PRB set to which the VRB set is mapped represents the physical time-frequency resource where potential e-PDCCH transmission may exist.
  • FIGS. 23 to 29 it is assumed that five cells are set for the UE, Cell 1
  • the order or the specific location where Cell 1 SS, Cell 2 SS, Cell 3 SS, Cell 4 SS, and Cell 5 SS are mapped on time-frequency resources is merely exemplary and the present invention. This is not limited to this. That is, it is apparent that the SS may be set in a different order or resource location than shown in Figs. In the example of FIGS. 23 to 29, for convenience of description, the SS for each cell is sequentially set according to the PRB index order, and the PRB index to which the SS for each cell is mapped may be different.
  • the size and position in the physical resource region of the DL allocation e-PDCCH SS and / or UL grant e-PDCCH SS shown in FIGS. 23 to 29 are merely exemplary, and the scope of the present invention is not limited thereto.
  • FIG. 23 is a diagram illustrating an example in which a discovery space for CRS based e-PDCCH is set.
  • e-PDCCH or e-PDCCH allocated to the first slot
  • the method described below may be equally applied.
  • the e-PDCCH for all cells may be located in the PCell.
  • all five SS VRB sets for five cells are mapped to PRBs on a PCell. That is, the SS for the PCell and the SS for the SCell (s) are configured on the PCell, where the UE performs e-PDCCH blind decoding to obtain DL allocation scheduling information for each cell, and the DL allocation indicates that The PDSCH transmitted in the resource region (PCell or SCell (s)) can be demodulated.
  • the search space may be set to be distinguished for each cell. If a set of SSVTRBs is given separately for each cell (ie one VRB set defines only the SS for a particular cell), it should be possible to avoid stratification in the VRB-to-PRB mapping setup.
  • the scheduler maps VRB indexes to PRB indexes.
  • the PRB set to which the VRB set for the PCell is mapped and the PRB set to which the B set for the SCell is mapped may not be overlapped. For example, if the VRB index and the PRB index have a 1-to-1 mapping relationship, if the SS VRB set does not overlap for each cell, the PRB set mapped thereto does not overlap for each cell.
  • the PRB corresponding to the search space that is, the physical resource region in which the potential e-PDCCH transmission exists
  • the PRB to which the e-PDCCH is transmitted is not duplicated for each cell.
  • the search space may not be exclusively set for each cell, it is preferable to set the search space for each cell as exclusively as possible.
  • search spaces for a plurality of cells may be shared. That is, although e-PDCCHs for a plurality of cells are not transmitted on the same physical resource, an area in which e-PDCCHs for a plurality of cells may be transmitted may be shared without being defined separately for each of the plurality of cells.
  • a search space may be configured using one signaling (signal defining SS VRB set), and e-PDCCH for all cells may be transmitted on the corresponding search space.
  • ten VRBs are defined as a shared search space, and an e-PDCCH for a PCell and an e-PDCCH for an SCell may be blind decoded on a PRB mapped to the ten VRBs.
  • the SS resource region the resource region for which the terminal should attempt blind decoding
  • the blind decoding complexity does not increase but the degree of freedom of e-PDCCH allocation may increase. have.
  • the SS for all the cells is set on the PCell, but the present invention is not limited thereto.
  • a search space of the e-PDCCH for the plurality of cells may be set in any one of the plurality of cells.
  • the resource region at the specific time point of the corresponding cell and / or It may also be set as a search space for e-PDCCH for another cell.
  • FIG. 24 illustrates a UL grant e-PDCCH (or, in a second slot) in addition to the example of FIG. 23. It shows how to set the SS of the allocated e-PDCCH.
  • the principles of the present invention described with reference to FIG. 23 may be equally applied.
  • FIG. 25 illustrates an example in which a DMRS based e-PDCCH search space is set when cross interleaving is not applied. In the example of FIG. 25, only the DL allocation e-PDCCH (or the e-PDCCH allocated to the first slot) is exemplarily illustrated to clearly illustrate the principles of the present invention.
  • the PDSCH is transmitted together and the PDSCH is also demodulated based on the DMRS in view of frequency selective scheduling gain. Therefore, the PRB corresponding to the DMRS based e-PDCCH search space for each cell is preferably arranged on each CeU.
  • a VRB set for each cell may be allocated through higher layer signaling, and an SS may be configured for each cell.
  • the physical resource location of the SS mapped to the VRB set for each cell is represented by the SS for Cell 1 on Cell 1, the SS for Cell 2 on Cell 2, and the SS on Cell 3 on Cell 3 SS for Cell 4 may be set to exist on Cell 4, and SS for Cell 5 exists on Cell 5.
  • e—PDCCH for one cell and e-PDCCH for another cell may cause mutual interference. Since the e-PDCCH exists on an OFDM symbol different from the PDCCH region (for example, the control region of FIG. 3), the influence of the interference between the e-PDCCHs is not large, but it may still be required to minimize the inter-cell interference.
  • SS hopping or shifting based on Cell ID may be considered.
  • SS hopping / shifting may be a method in which a resource region defining an SS is determined by a cell ID, and the SS resource region of one cell does not overlap (or orthogonal) the SS resource region of another cell.
  • SSs for a plurality of cells may be located on a resource region of one specific cell (eg, PCell). That is, even in the case of DMRS-based e-PDCCH as shown in FIG.
  • the SS may be set in the form. For example, in the VRB-to-PRB mapping, all PRBs to which the SS VRB set configured for each cell is mapped may exist on the PCell. In this case, the VRB set for each cell may be set and signaled to avoid duplication or collision between PRB sets to which VRB sets for different cells are mapped.
  • the PRB set to which the SS VRB set for some cells is mapped among the plurality of cells may be configured to overlap. This is because the time when the actual e-PDCCH is transmitted even if the SS is duplicated—it can be decoded correctly unless the frequency resource region is increased.
  • SSs for all of the plurality of cells may be shared. In this case, the blind decoding complexity does not increase, but the degree of freedom of e-PDCCH allocation may increase.
  • FIG. 26 illustrates a method for setting an SS of an UL grant e-PDCCH (or an e-PDCCH allocated to a second slot) in addition to the example of FIG. 25.
  • the principles of the present invention described with reference to FIG. 25 may be equally applied.
  • FIG. 27 shows an example of search space configuration when e-PDCCHs of different attributes coexist.
  • e-PDCCHs of different attributes coexist.
  • only DL allocation e-PDCCH (or e-PDCCH allocated to the first slot) is exemplarily illustrated to clearly illustrate the principles of the present invention.
  • the RS used for e-PDCCH demodulation of the UE may be different for each cell.
  • an e-PDCCH mapping scheme (ie, whether cross interleaving is applied) may be different for each cell.
  • CCS may or may not be applied based on e-PDCCH RS, or CCS may or may not be applied according to an e-PDCCH mapping scheme. Therefore, based on the e-PDCCH RS or e-PDCCH mapping scheme in each cell, e—PDCCHSS for a particular cell is set on the corresponding cell or on one specific cell (eg, PCell). Can be defined. .
  • all SSs for a cell supporting an e-PDCCH mapped in a cross interleaving scheme may be located on a PCell.
  • SS for a cell supporting e-PDCCH mapped in a non-cross interleaving scheme may be individually configured on each cell.
  • Cell 1, Cell 2, and Cell 3 supporting the cross interleaving scheme are used.
  • the SSs for all are located on Cell 1 (PCell), and the SSs for Cells 4 and 5, which support the non-cross interleaving scheme, are located on Cells 4 and 5, respectively.
  • all SSs for a cell supporting the e-PDCCH demodulated by the CRS may be located on the PCell.
  • the SS for the cell supporting the e-PDCCH demodulated by DMRS may be individually configured on each cell.
  • SSs for Cell 1, Cell 2, and Cell 3 supporting CRS based e-PDCCH demodulation are all located on Cell 1 (PCell), and Cel 1 4 and Cel supporting DMRS based e-PDCCH demodulation.
  • SS for 1 5 represents located on Cell 4 and Cell 5, respectively.
  • the SS in the case of the e-PDCCH that is demodulated based on CRS and mapped in a cross interleaving manner, the SS is located on the PCell, and in the case of the e-PDCCH that is demodulated based on DMRS and mapped in a non-cross interleaving manner, each SS is mapped. Positioning on the cell of the cell can be clearly defined. Meanwhile, in the case of an e-PDCCH that is demodulated based on CRS and mapped in a non-cross interleaving scheme, whether the SS is located on a PCell or each cell may be determined according to a predetermined criterion. For example, an e-PDCCH mapping scheme may be applied as a priority criterion, or an e-PDCCH RS may be applied as a preferential criterion, and thus, an SS configuration may be determined.
  • a predetermined criterion For example, an e-PDCCH mapping scheme may be applied
  • FIG. 28 illustrates a method of configuring an SS of an UL grant e-PDCCH (or an e-PDCCH allocated to a second slot) in addition to the example of FIG. 27.
  • the principles of the present invention described with reference to FIG. 27 may be equally applied.
  • FIG. 29 shows an example in which an e-PDCCH mapping scheme is not distinguished and all e-PDCCH SSs are set to exist on a specific cell (eg, PCell). That is, even in the case of an e-PDCCH mapped in a non-cross interleaving scheme, the SS may be located on the PCell.
  • a specific cell eg, PCell
  • FIG. 30 is a flowchart illustrating a PDCCH search space configuration signaling and a PDCCH transmission / reception method according to the present invention.
  • the PDCCH described in FIG. 30 may correspond to the aforementioned e-PDCCH or a new type of PDCCH.
  • the downlink transmission apparatus may configure a PDCCH SS for a specific downlink reception apparatus, and transmit configuration information on a VRB set corresponding to the corresponding PDCCH SS to the downlink reception apparatus.
  • the PDCCH SS VRB set configuration method may be defined based on whether cross interleaving is applied in one or more cells and / or the type of PDCCH RS, and the like. Is omitted.
  • the signaling scheme for the PDCCH SS VRB configuration information may be defined based on whether cross interleaving is applied in one or more cells and / or the type of the PDCCH RS, as described in various embodiments of the present invention. Duplicate description thereof will be omitted.
  • the downlink receiving apparatus may receive configuration information on the PDCCH SS VRB set. Based on the PDCCH SSVRB configuration information, the downlink receiving apparatus may determine a resource location (eg, a specific PRB set of a specific cell) to monitor the PDCCH transmitted to the downlink receiving apparatus.
  • a resource location eg, a specific PRB set of a specific cell
  • the downlink transmission apparatus may transmit the PDCCH in some or all resource regions on the configured SS.
  • the downlink receiving apparatus monitors PDCCH transmission on the SS. That is, since the downlink receiving apparatus cannot know in which resource region on the SS, the PDCCH is transmitted, blind decoding assuming various PDCCH formats on the SS can be performed.
  • the downlink receiving apparatus may demodulate the monitored PDCCH. Accordingly, the downlink receiving apparatus may obtain downlink control information (for example, DL allocation and / or UL grant scheduling information) for the downlink receiving apparatus.
  • downlink control information for example, DL allocation and / or UL grant scheduling information
  • the downlink transmission entity has been mainly described using a base station as an example
  • the downlink reception entity has been mainly described using a terminal as an example, but the scope of the present invention is not limited thereto. That is, the present invention may also be used when a repeater becomes a downlink transmitting entity to a terminal or an uplink receiving entity from a terminal, or when a repeater becomes an uplink transmitting entity to a base station or a downlink receiving entity from a base station.
  • the principles of the present invention described through various embodiments of may be equally applied.
  • FIG. 31 is a diagram showing the configuration of a preferred embodiment of a downlink transmission apparatus and a downlink reception apparatus according to the present invention.
  • the downlink transmission apparatus 3110 includes a reception module 3111, a transmission module 3112, a processor 3113, a memory 3114, and a plurality of antennas 3115. can do.
  • the plurality of antennas 3115 refers to a downlink transmission apparatus that supports MIM0 transmission and reception.
  • the receivers 3111 may receive various signals, data, and information on the uplink from the downlink receiver 3120.
  • the transmission modules 3112 may transmit various signals, data, and information on the downlink to the downlink reception device 3120.
  • the processor 3113 may control operations of the overall downlink transmission device 3110.
  • the downlink transmission apparatus 3110 may be configured to transmit a PDCCH (or e-PDCCH) to a downlink reception apparatus 3120 in which one or more cells are configured.
  • the processor 3113 of the downlink transmission apparatus 3110 may be configured to transmit information for setting a PDCCH SS (or a resource region for potential PDCCH transmission) through the transmission module 3112.
  • the processor 3113 may be configured to transmit the PDCCH through the transmission module 3112 on some or all resource regions on the PDCCH SS.
  • the processor 3113 of the downlink transmission apparatus 3110 performs a function of processing information received by the downlink transmission apparatus 3110, information to be transmitted to the outside, and the memory 3114. Etc. may be stored for a predetermined time, and may be replaced with a component such as a buffer (not shown).
  • the downlink receiving apparatus 3120 includes a reception module 3121, a transmission module 3122, a processor 3123, a memory 3124, and a plurality of antennas 3125. can do.
  • the plurality of antennas 3125 refers to a downlink receiving apparatus supporting MIM0 transmission and reception.
  • the receivers 3121 may receive various signals, data, and information on the downlink from the downlink transmission device 3110.
  • the receivers 3122 may transmit various signals, data, and information on the uplink to the downlink transmission device 3110.
  • the processor 3123 may control operations of the overall downlink receiving device 3120.
  • the downlink receiving apparatus 3120 may be configured with one or more cells and configured to receive a PDCCH (or e-PDCCH).
  • the processor 3123 of the downlink receiving apparatus 3120 may be configured to receive information for setting a PDCCH SS (or a resource region for potential PDCCH transmission) through the receiving module 3121.
  • the processor 3123 may be configured to monitor the transmission of the PDCCH on the PDCCH SS and to demodulate the PDCCH.
  • the processor 3123 of the downlink receiving apparatus 3120 performs a function of processing information received by the downlink receiving apparatus 3120, information to be transmitted to the outside, and the memory 3124. It may be stored for a predetermined time, and may be replaced by a component such as a buffer (not shown).
  • description of the downlink transmission device 3110 of FIG. The same may also be applied to the repeater apparatus as a downlink transmitting entity or an uplink receiving entity.
  • description of the downlink receiving apparatus 3110 of FIG. 31 may be applied to the terminal, or may be equally applied to a relay apparatus as an uplink transmitting entity or a downlink receiving entity.
  • Embodiments of the present invention described above may be implemented through various means. E.g, Embodiments of the invention may be implemented by hardware, firmware, software or a combination thereof.
  • the method according to embodiments of the present invention may include one or more ASICs (Applicat Specific Specific Circuits), DSPs (Digital Signal Processors), DSPDs (Digital Signal Processing Devices), PLDs (Programmable Logic) Devices), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs Applicat Specific Specific Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • the method according to the embodiments of the present invention may be implemented in the form of modules, procedures or functions for performing the functions or operations described above.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • Embodiments of the present invention as described above may be applied to various mobile communication systems.

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Abstract

La présente invention concerne un système de communication sans fil, et porte en particulier sur un procédé et un appareil de réception de liaison descendante, dans lequel au moins une cellule est configurée, pour transmettre et recevoir un canal de commande de liaison descendante. Selon un mode de réalisation de la présente invention, le procédé de réception du canal de commande de liaison descendante physique (PDCCH) par l'appareil de réception de liaison descendante dans lequel au moins une cellule est configurée comprend : une étape de réception d'informations de réglage d'ensemble de blocs de ressources virtuelles (VRB) pour une transmission PDCCH potentielle ; et une étape de surveillance de l'ensemble VRB et de démodulation du PDCCH. Des informations sur l'ensemble VRB, en ce qui concerne une cellule pour laquelle un entrelacement non croisé PDCCH est réglé ou une cellule pour laquelle la démodulation PDCCH est réglée, sur la base d'un signal de référence spécifique à un appareil de réception de liaison descendante, peuvent être définies en commun pour un premier créneau et un second créneau dans une sous-trame de liaison descendante.
PCT/KR2012/002488 2011-04-03 2012-04-03 Procédé et appareil de transmission/réception de canal de commande de liaison descendante dans un système de communication sans fil WO2012138097A2 (fr)

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KR1020137023763A KR102109408B1 (ko) 2011-04-03 2012-04-03 무선 통신 시스템에서 하향링크 제어 채널을 송수신하는 방법 및 장치
US14/008,450 US9363805B2 (en) 2011-04-03 2012-04-03 Method and apparatus for transmitting/receiving downlink control channel in wireless communication system

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103796309A (zh) * 2012-10-31 2014-05-14 华为终端有限公司 控制信息的传输方法、基站及用户设备
US20140198675A1 (en) * 2013-01-17 2014-07-17 Hong He Channel state information-reference signal patterns for time division duplex systems in long term evolution wireless networks
WO2014110815A1 (fr) * 2013-01-18 2014-07-24 华为技术有限公司 Procédé de détection, procédé de transmission et appareil pour canal de commande commun
WO2015000917A2 (fr) * 2013-07-03 2015-01-08 Huawei Technologies Co., Ltd. Systèmes et procédés de transmission de messages d'informations de données sur un système de communication sans fil en liaison descendante
KR20150099411A (ko) * 2014-02-20 2015-08-31 주식회사 케이티 데이터 송수신 방법 및 그 장치
CN107682136A (zh) * 2013-01-18 2018-02-09 华为技术有限公司 一种确定epdcch候选的方法及设备
US9961681B2 (en) 2014-01-24 2018-05-01 Huawei Technologies Co., Ltd. Information transmission method, user equipment, and base station

Families Citing this family (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130336193A1 (en) 2012-06-19 2013-12-19 Qualcomm Incorporated Network information for assisting user equipment
US9264097B2 (en) 2009-06-04 2016-02-16 Qualcomm Incorporated Interference mitigation for downlink in a wireless communication system
JP5961853B2 (ja) * 2011-04-27 2016-08-02 シャープ株式会社 端末、基地局、通信システムおよび通信方法
JP5895356B2 (ja) * 2011-04-27 2016-03-30 シャープ株式会社 基地局、端末および無線通信方法
JP5801093B2 (ja) * 2011-04-27 2015-10-28 シャープ株式会社 基地局、端末、通信システムおよび通信方法
JP5810399B2 (ja) * 2011-04-27 2015-11-11 シャープ株式会社 基地局、端末および無線通信方法
PT3048753T (pt) * 2011-05-03 2019-05-29 Ericsson Telefon Ab L M Monitorização de canal de controlo com base em área de pesquisa
US9351289B2 (en) * 2011-06-06 2016-05-24 Lg Electronics Inc. Method for transmitting uplink control information and user equipment, and method for receiving uplink control information and base station
KR101741059B1 (ko) * 2011-06-27 2017-06-15 삼성전자 주식회사 ＣｏＭＰ 단말의 스케줄링 방법 및 장치
JP5895388B2 (ja) * 2011-07-22 2016-03-30 シャープ株式会社 端末装置、基地局装置、集積回路および通信方法
WO2013015632A2 (fr) 2011-07-26 2013-01-31 엘지전자 주식회사 Procédé et appareil permettant de transmettre des informations de commande dans un système de communication sans fil
WO2013023170A1 (fr) * 2011-08-11 2013-02-14 Research In Motion Limited Transmission en diversité avec sélection de ressources orthogonales et affectation de ressources
KR102217646B1 (ko) * 2012-05-24 2021-02-19 삼성전자 주식회사 이동 통신 시스템 및 그 이동 통신 시스템에서 채널 송수신 방법
JP5554799B2 (ja) * 2012-03-19 2014-07-23 株式会社Ｎｔｔドコモ 無線基地局装置、ユーザ端末、無線通信システム及び無線通信方法
KR102127836B1 (ko) * 2012-05-08 2020-06-29 한국전자통신연구원 엘티이기반 이동통신시스템에서 낮은 피에이피알을 가지는 향상된 하향링크 전송 방법
JP5809103B2 (ja) * 2012-05-09 2015-11-10 株式会社Ｎｔｔドコモ 無線基地局、ユーザ端末、無線通信システム及び無線通信方法
US9686772B2 (en) * 2012-08-01 2017-06-20 Qualcomm Incorporated Methods and apparatus for coordinated multipoint (CoMP) communications
CN103580837B (zh) * 2012-08-03 2019-01-22 中兴通讯股份有限公司 控制信令发送、检测方法及基站及终端
CN104956749B (zh) * 2013-01-29 2019-08-16 太阳专利托管公司 基站、终端以及通信方法
US9706522B2 (en) * 2013-03-01 2017-07-11 Intel IP Corporation Wireless local area network (WLAN) traffic offloading
US9210670B2 (en) * 2013-03-18 2015-12-08 Samsung Electronics Co., Ltd. Uplink power control in adaptively configured TDD communication systems
US9986590B2 (en) * 2013-09-17 2018-05-29 Lg Electronics Inc. Method for concurrently accessing plurality of cells and user equipment
WO2016004634A1 (fr) 2014-07-11 2016-01-14 Mediatek Singapore Pte. Ltd. Procédé pour la transmission et la réception de liaison montante par un enb et un ue
US10292148B2 (en) 2014-11-07 2019-05-14 Panasonic Intellectual Property Corporation Of America Resource allocation for transmissions on unlicensed carriers
JP6359760B2 (ja) * 2015-03-20 2018-07-18 株式会社東芝 無線通信装置および無線通信方法
JP6313519B2 (ja) 2015-03-20 2018-04-18 株式会社東芝 無線通信装置
WO2017018761A1 (fr) * 2015-07-24 2017-02-02 엘지전자 주식회사 Procédé de réception d'informations de commande et équipement d'utilisateur, et procédé de réception d'informations de commande et station de base
US10277270B2 (en) * 2015-12-08 2019-04-30 Lg Electronics Inc. Method for transmitting uplink signal in a wireless communication system and apparatus for the same
CN107534883B (zh) * 2016-01-25 2020-07-14 诸暨易和项目投资有限公司 下行信道状态信息的获取方法和装置
US10687335B2 (en) 2016-06-10 2020-06-16 Qualcomm Incorporated Informing base station regarding user equipment's reception of beam change instruction
KR20180068677A (ko) * 2016-12-14 2018-06-22 삼성전자주식회사 무선 통신 시스템에서 하향링크 제어채널의 송수신 방법 및 장치
CN117500060A (zh) * 2016-12-30 2024-02-02 华为技术有限公司 控制信道的资源指示方法、用户设备和网络设备
US10595217B2 (en) 2017-02-13 2020-03-17 Qualcomm Incorporated Flexible interleaving for wireless communications
US10931411B2 (en) 2017-03-13 2021-02-23 Qualcomm Incorporated Uplink ACK resource allocation in new radio
CN108811131B (zh) * 2017-05-05 2023-09-15 中兴通讯股份有限公司 资源配置方法及装置，基站和终端
US10299221B1 (en) 2017-05-18 2019-05-21 Sprint Spectrum L.P. Systems and methods for managing channel quality for relay wireless devices
US10158454B1 (en) 2017-06-15 2018-12-18 At&T Intellectual Property I, L.P. Adaptive interleaver for wireless communication systems
WO2019014923A1 (fr) * 2017-07-21 2019-01-24 Oppo广东移动通信有限公司 Procédé de transmission de données, dispositif terminal et dispositif réseau
US10278227B2 (en) 2017-09-01 2019-04-30 Google Llc Downlink-only fifth generation new radio
US11026215B2 (en) * 2017-09-15 2021-06-01 Apple Inc. UE specific search space and a common search space in a wide coverage enhancement
US11381979B2 (en) * 2017-09-20 2022-07-05 Telefonaktiebolaget Lm Ericsson (Publ) Standalone unlicensed spectrum carrier aggregation combinations using dynamic frequency selection (DFS) spectrum
US20190132831A1 (en) * 2017-10-30 2019-05-02 Google Llc Resource Element-Level Allocation For Wireless Communication
EP3706356B1 (fr) 2018-01-18 2022-12-21 LG Electronics Inc. Procédé de réception de signaux de liaison descendante entre un terminal et une station de base dans un système de communication sans fil, et dispositif prenant en charge ledit procédé
CN110351849B (zh) * 2018-04-04 2023-07-04 大唐移动通信设备有限公司 资源分配方法及装置、基站和终端
CN110972320B (zh) * 2018-09-30 2022-01-25 维沃移动通信有限公司 接收方法、发送方法、终端及网络侧设备
KR20240066217A (ko) * 2022-11-04 2024-05-14 삼성전자주식회사 무선 통신 시스템에서 전 이중 통신을 위한 하향링크 데이터 채널 전송 방법 및 장치

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4976543B2 (ja) 2007-04-27 2012-07-18 エルジー エレクトロニクス インコーポレイティド 移動通信システムにおいて下り制御チャネルを伝送する方法並びにブロックインターリーバを用いて制御チャネルを物理リソースにマッピングする方法
US8493835B2 (en) * 2008-03-26 2013-07-23 Qualcomm, Incorporated Method and apparatus for mapping virtual resources to physical resources in a wireless communication system
KR100921467B1 (ko) * 2008-06-19 2009-10-13 엘지전자 주식회사 셀룰라 다중반송파 시스템에서 조밀도를 조절하는 자원할당시그널링 방식
KR101520708B1 (ko) * 2008-08-12 2015-05-15 엘지전자 주식회사 다중반송파 무선통신시스템에서 하향링크 제어정보를 송수신하는 방법 및 장치
EP2424139A4 (fr) 2009-04-24 2016-05-18 Lg Electronics Inc Procédé et appareil pour transmettre et recevoir un signal de commande pour fusionner des porteuses lors d'une transmission
GB2469689A (en) 2009-04-24 2010-10-27 Nec Corp Relay communications system
JP2011151545A (ja) * 2010-01-20 2011-08-04 Nec Corp 通信装置および受信方法、並びにプログラム
US9014081B2 (en) * 2010-04-09 2015-04-21 Futurewei Technologies, Inc. System and method for transmitting control information
EP2378703A1 (fr) * 2010-04-13 2011-10-19 Panasonic Corporation Cartographie d'informations de contrôle pour contrôler des éléments de canaux
WO2012109542A1 (fr) * 2011-02-11 2012-08-16 Interdigital Patent Holdings, Inc Systèmes et procédés pour canal de commande amélioré
US9001756B2 (en) * 2011-04-27 2015-04-07 Texas Instruments Incorporated Physical downlink control channel and physical hybrid automatic repeat request indicator channel enhancements

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2858439A4 (fr) * 2012-10-31 2015-09-09 Huawei Device Co Ltd Procédé de transmission d'informations de commande, station de base et équipement utilisateur
CN103796309A (zh) * 2012-10-31 2014-05-14 华为终端有限公司 控制信息的传输方法、基站及用户设备
JP2015537455A (ja) * 2012-10-31 2015-12-24 ▲華▼▲為▼▲終▼端有限公司 制御情報を伝送するための方法、基地局、及びユーザ機器
US20140198675A1 (en) * 2013-01-17 2014-07-17 Hong He Channel state information-reference signal patterns for time division duplex systems in long term evolution wireless networks
US9455811B2 (en) * 2013-01-17 2016-09-27 Intel IP Corporation Channel state information-reference signal patterns for time division duplex systems in long term evolution wireless networks
US9913265B2 (en) 2013-01-18 2018-03-06 Huawei Technologies Co., Ltd. Detecting method, transmitting method and apparatus for common control channel
CN104303569B (zh) * 2013-01-18 2018-10-30 华为技术有限公司 公共控制信道的检测方法、传输方法及装置
US10986637B2 (en) 2013-01-18 2021-04-20 Huawei Technologies Co., Ltd. EPDCCH candidate determining method and device
CN104303569A (zh) * 2013-01-18 2015-01-21 华为技术有限公司 公共控制信道的检测方法、传输方法及装置
EP2943027A4 (fr) * 2013-01-18 2016-03-23 Huawei Tech Co Ltd Procédé de détection, procédé de transmission et appareil pour canal de commande commun
CN107682136A (zh) * 2013-01-18 2018-02-09 华为技术有限公司 一种确定epdcch候选的方法及设备
WO2014110815A1 (fr) * 2013-01-18 2014-07-24 华为技术有限公司 Procédé de détection, procédé de transmission et appareil pour canal de commande commun
US11683809B2 (en) 2013-01-18 2023-06-20 Huawei Technologies Co., Ltd. Detecting method, transmitting method and apparatus for common control channel
US11089586B2 (en) 2013-01-18 2021-08-10 Huawei Technologies Co., Ltd. Detecting method, transmitting method and apparatus for common control channel
US10708898B2 (en) 2013-01-18 2020-07-07 Huawei Technologies Co., Ltd. Detecting method, transmitting method and apparatus for common control channel
WO2015000917A2 (fr) * 2013-07-03 2015-01-08 Huawei Technologies Co., Ltd. Systèmes et procédés de transmission de messages d'informations de données sur un système de communication sans fil en liaison descendante
EP3370467A1 (fr) * 2013-07-03 2018-09-05 Huawei Technologies Co., Ltd. Systèmes et procédés de transmission de messages d'information sur une liaison descendante d'un système de communication sans fil
EP4239941A3 (fr) * 2013-07-03 2023-11-22 Huawei Technologies Co., Ltd. Systèmes et procédés de transmission de messages d'informations de données sur une liaison descendante d'un système de communication sans fil
WO2015000917A3 (fr) * 2013-07-03 2015-03-05 Huawei Technologies Co., Ltd. Systèmes et procédés de transmission de messages d'informations de données sur un système de communication sans fil en liaison descendante
US9839018B2 (en) 2013-07-03 2017-12-05 Futurewei Technologies, Inc. Systems and methods for transmitting data information messages on a downlink of a wireless communication system
USRE48742E1 (en) 2013-07-03 2021-09-14 Futurewei Technologies, Inc. Systems and methods for transmitting data information messages on a downlink of a wireless communication system
US10687332B2 (en) 2014-01-24 2020-06-16 Huawei Technologies Co., Ltd. Information transmission method, user equipment, and base station
US9961681B2 (en) 2014-01-24 2018-05-01 Huawei Technologies Co., Ltd. Information transmission method, user equipment, and base station
US11510195B2 (en) 2014-01-24 2022-11-22 Huawei Technologies Co., Ltd. Information transmission method, user equipment, and base station
KR20150099411A (ko) * 2014-02-20 2015-08-31 주식회사 케이티 데이터 송수신 방법 및 그 장치
KR102129957B1 (ko) 2014-02-20 2020-07-06 주식회사 케이티 데이터 송수신 방법 및 그 장치

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